How can I improve my system

I have cobbled together quite a nice system over the years and have heard quite a few far more expensive systems that did not sound as good to my ears as what I have. However, I recently walked into a showroom and their setup blew mine out of the water, despite not being "ultra high-end". So now I'm wondering where I should upgrade to take my setup to the next level. The showroom system was all (expensive) Krell (10K pre, 10K power, 12K source), yet modest 10K Thiel speakers. I have source: heavily modified Denon 3910 + upgraded Audio Note 1.1 DAC, McCormack MAP1 pre (used mostly in "surround" mode). Odessey Stratos Mono Extreme Power and Silverline Audio LaFolia speakers. Misc. high quality cabling. I think my weakest link may be the Silverlines or the McCormack. I always liked the Revel Studios so this could be an options. Modding the MAP1 is also an options. Any suggestions are welcome.
I disagree about what you consider to be your weakest link. As a Silverline Sonata III owner, and as one who has gone through several amps for these speakers, I can say they are extremely revealing of what is upstream.

IMO, your weakest link is the Odyssey Stratos Mono Extreme amps (I have owned them). The Silverlines will respond like exotic sports cars with more refined amplification. Alan Yun recommended Belles and Pass Labs to me, and I have to agree with him after owning both. The Odyssey amps are excellent, but the Belles and Pass Labs are a step up in transparency. You'll have to hear them to understand what I'm describing, but once you do I believe you'll agree.

That said, it's almost impossible to sway someone from making a change once they have decided to make it. Generally, I have found that folks seek opinions that reinforce the changes they are considering.
I suspect that the biggest difference in what you heard at the showroom was the speakers and room. I am not sure if that helps...
I agree with Shadorne's room comment. A dialed-in, acoustically tuned audio showroom will likely outperform the majority of audiophile's rooms.
I am on board with Shad and Tvad. Before you go chasing your tail by replacing components, look at your room. Do you have any type of treatments currently? Have you tried changing the placement of the speakers? IMO, the room is the most important thing if you have good to great equipment. You can drop $50k on a system and if it is in a bad room or setup incorrectly it will not sound good.
Interesting (and quick feedback) many thanks. Not sure about the amp route (I owned Belles - albeit only 150A hotrod - and the Stratus were a big step up in my experience). But the room acoustics and speaker placement are intriguing. For additional reference, the main improvement from the "showroom" setup was the system sounded "bigger" and the speakers dissappeared more. Dynamics, timbre and musicality was not an issue. So could this be setup/room related? Then next question how do you systemtically go about optimizing room / speaker placement. Do you need room analysis? Just moving the speakers around and see what happens does not sound like the best idea.
Edorr- Peruse some of the info on this site for enlightenment: ( Enjoy the experimentation!
You can do your own room analysis.There are numerous set up theories/formulas you can look at on the net - Cardas, Physic's, Donlevy's (as they applied to his speakers) and Rives has a CARA program on his site which allows you to plug in your room dimensions, speaker brand, and it will spit out a suggested starting point. Just a starting point! Use a SPL meter and a test disc with 1/3d octave pink noise to dial in your bass which you accomplish by speaker movements as well as listening chair movement, and when accomplished use your ears to fine tune imaging (mid/upper ffrequencies) by either toe in or room treatments to reduce reflections from side walls, floors, etc. This is not a plug an play process. Its going to take a long time with patience in listening and speaker/chair movements. You make a lot graphs showing the results of different placements so you can learn about your room and placements. It will help you in understand things about your room/set up sound which are susceptible to change and which are immutable. IMHO this is one of the most rewarding things you can do in audio unless you are capapable of making your own equipment. :-)

If you want to get some user comments/suggestions just list your room dimensions, describe your furniture types, rugs, bookcases, etc, their location, room openings, and windows. Folks will be happy to give you some recommendations, which will serve as a rough guide.

As a Silverline owner let me say that I think your speakers are about the last thing I would consider changing in your system. I totally agree with Tvad's comments. I almost bought them, but I selected the Boleros in the end.
Edorr- I should have noted: Your treatments don't have to be as expensive as what's on the site I mentioned. If you type "acoustic foam" into the search bar on eBay, a ton of treatment alternatives will come up. To find your primary reflection points: replace your speakers with a pair of lamps(the bulbs should be at the same height as your tweeters). Sit in your exact listening position, and have a friend move a mirror along the walls(behind the speakers and both sides)at the height of your ears. Anywhere that you can see the lamps reflected in the mirror, you need to apply some sound absorbing or dispersing material. The ceiling will have reflections also, if your speakers have a wide dispersion pattern(a little trickier to find, unless your friend is Spiderman).
Nothing wrong with your set up, but those modest 10K Thiels are pretty good speakers. Just my .02.
You can't make an apples-to-apples comparison of a Belles 150A Hotrod to a Belles 150A Reference or 350A Reference, just as you can't compare an Odyssey Stratos Extreme mono to a regular Odyssey Stratos.

But Belles aside, the Odyssey amps are the weak link in your system, IMO.

Try a Pass Labs XA-30.5 and you'll know immediately.