How Do I Start Playing With the Big Boys and Girls

I'm driving my Signums with a Krell KAV 300i. This integrated has performed very well with other monitors in the Sonus Faber line as well. A double run of OCOS speaker cable really works well with this setup, as does a REL subwoofer. In my room, the sub allows me to locate the speaker a little closer to the wall which makes the detail quite vivid. In my large room, I am trading off some soundstage, and orchestral punch, for this precision, but that's my current focus.

Thank you for the many suggestions. The first thing I've done is to start to explore the reviews on the Rogue Audio pre-amps and amps. I'm intrigued with these and have emailed the company to find out who carries these in Northern New England/Boston area. To respond to some of your threads, I'd say that I could spend between 3,000 to 4,000 for the pre-amp and amp combination. The room is a fairly large living room, and dining area. Jdombrow mentioned cables which I haven't considered, and at this point I'm totally in the dark about these important accessories. When you talk about minimum power for an amp versus the speaker requirement, are you saying that the amp should be able to power no higher than the power rating for the speakers? I purchased the Sonus Faber Signums used (over eBay) and there weren't any spec sheets on a manual with them so at this point I don't know the minimum power needs are. The Signums are from 98/99. I'm running a Luxman 200 watt amp M-117, which the Signums seem to be handling. I don't mind buying used at all. In fact I like the idea of getting the original owners input on the equipment. Sogood51 and Crazyblues indicate to forget the tubes and remain solid-state, which from what I've seen so far pits the tubers against the solids with each having very strong feelings about which way to go. It must be the endless audio debate. Your continued input is very helpful. Thank you!

I stand corrected on the speakers' vintage...

The speakers are fine and I do not think you need to change them out just now. They will hold their own for some time to come. You will want an amp with a minimum of 50 wpc given the speaker and room size. Your budget gives you lots of options. Rouge as you mentioned. Cary, CJ and Manley. What type of music do you listen to? This will help narrow the field for the amps.

Cellorover's asks about yr musical tastes. This is important.If you listen to classical/jazz (i.e., lots of acoustic instruments) I can indicate certain products that match very well with the SF speaker line/sound.
Please note that this is NOT exhaustive, there are many excellent products out there (& your ears are the ultimate decision-maker) -- but these electronics have been used to demonstrate SF speakers (used, within your budget):
*YBA Passion (ss; integrated or separates)
*Jadis integrated (tube; the separates are very expensive)
*Symphonic Line integrated (ss; various models, the smaller ones will drive the Signums, but the bigger & more expensive ones are much better).
*Spectral (ss; difficult to find within yr budget -- but not impossible)

Many, many other choices. Your speakers are very "euphonic", lush, & musical. They like amps that offer lots of detail, speed, and control. Cheers