Idiot trying to upgrade his system - likes the tube sound


I currently have a McIntosh C275 tube amp with Wilson WattPuppy 7 speakers, along with a MC22 preamp and redbook CD player. I don't like vinyl records (for the most part). I heard SACD's and DSD high resolution, so want to go with a better SACD / DAC combination. My local audio folks (Paragon in Ann Arbor, MI) are nice folks, but cater to the wealthy. I have $$$, having sold 2 of my biotech companies, but I am a careful person about spending money on audio. I am 62 and a professor at a medical school.

Sorry for the long intro- Here is my question: Should I trade in my Rotel (very nice) CD player and MC22 preamp - get the new Marantz SA-10 SACD player, but then what should I hook that into? A new 1100 McIntosh digital or analogue preamp? Should I buy a more powerful ampilifier then the MC275 (at 75 watts per channel)? Any advice out there - I woud be very grateful. Thank-you! 
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Oppo is the price/performance leader for disc players, tho some like Marantz

Do you like the McIntosh "house sound"?

If yes, then will a more powerful amp allow you to avoid clipping?  You will want to find that out ...

It does sound like you will appreciate the need for double-blind listening tests, so assemble a disc or two of your music that you'll use for listening tests and buy from places that will allow a return after 30 days, etc.
As for tubes my experience with the Octave V40se (40W) - V70se (70W) and V110 (110W) made very minor differences. I started with Dyn C1 signatures and later went to Raidho D1's and D2's. The main difference was as I moved up the ladder I could hear a hair more 'control' in the music.

randy-11 as far as clipping tubes are very different and nowhere as noticeable as SS. What was noticeable was the tubes they would 'run out of steam' when pushed hard. It was much more noticeable with the Raidho's. But if you don't listen extremely loud tubes are great. Also with the 'house sound' that can easily be changed by try different tubes.
Based on Marantz's past reference products, the SA-10 sounds like a good bet for fantastic digital.  Unless you listen at very loud levels or have an unusually large listening space, your 75 watt/ch. amp should be fine.  With the warmish Marantz house sound and the tube amp, perhaps a fine SS preamp might provide some sonic balance especially through highly resolving speakers like the Wilsons.  What you end up with may in large part depend on your location and the choices that audio salons near you can offer.

If you are shopping in the SA10 price range, I think you should get in touch with your local dealer and see what they suggest.  They may be able to assist you in changing a component to bring the system more in line with what you want to hear and it's not always what you think.  I recall being floored at the difference a preamp upgrade made during a dealer demo.  I was absolutely certain I needed to change the amplifier, but the dealer showed me that it was the preamp causing the sonic issues I was hearing.  He could have sold me either, so it made no difference to him. 
Anyway, that's what I would do.  
VTL amps and Esoteric for digital.  Both can be on the pricy side but quality and performance cost!