Hi Longhorn,
I don't think any receiver will sound as good as that old Adcom coupled with a decent preamp. I personally use an ARC SP9 MkII. I am insanely happy with it. If you are happy with the Adcom sound, one of their preamps can be bought for a very reasonable price (GFP-555II). The Adcom preamp has a phono preamp. This is a consideration if you play vinyl. I can't comment about any receivers as I have never owned one. The dimensions of your room, particularly the ceiling height suggest an older home. I think this is a good thing. The construction is much more rigid. This is always good for bass. I don't know if all the dimensions being divisible by 3 is significant.

Hi, Longhorn -- I second JoeE. I have owned numerous Adcoms in the past, and the power amplifiers sound very close to state-of-the-art. There are nit-picking issues (the ultimate in transparency and soundstage depth), but the overall sound of just about any Adcom will get you at least 90% of the sound of any super amp out there. Plus, they have outstanding customer service and reliability. I currently own the GFP-750 preamp(I'm using the Musical Fidelity A-308cr, but I'll never sell the Adcom), which gives you the option of passive or active operation, and which used to be rated "class A" in Stereophile (deservedly so, in my opinion). I see them pop up on Audiogon, occasionally, for around 500-700 bucks. This would be an excellent buy, but this model has no phono section -- you could add one, since there are more and more cheap ones coming on the market, and many of them sound great. But JoeE is right: no receiver that I know of can compete with the Adcom separates. I haven't heard the Magnum Dynalab receiver, but it costs upwards of 3 grand, as I recall...and the sound STILL might not be as good as that of your Adcom. Happy tunes, Clifton.