NAD vs. Adcom

Depending on budget, I would look at something other than the Adcom amp.....besides it being an old amp, its not very musical sounding at all.

I agree that Adcom products are not very musical. However, many people seem to like to 555 II. What is your budget? Maybe you could get into a McCormack amp-say the DNA .5. That is a very good amp. If not, try a B&K ST-140. Very musical, 120 watts per channel, and used its about $200. Enjoy.

This looks like a very good deal and a step up.
http://www.audiogon.com/cgi-bin/cls.pl?ampstran&1259646345&/Mccormack-Dna-0.5-classic-litt

I owned (4) GFA555IIs.
I owned (2) GFA 5500s.
The 555s are & were great for sub amps, but forward (bright) on my Magnepan 3.3Rs.
The 5500 is current, and sounds much more musical, to me.
I only sold both to go to Fully Balanced amps.

Ive own 3 Adcom amps 5802 ,555 ,2535 . If you have speakers that are bright go with the 5500 . Dull speakers would benefit from the 555ii . Mosfets almost always sound better than bi-polar in my opinion.