What is a good amp that cost no more then 3500.00

You might try a Bryston 4BST. 250 watts into 8 ohms,
20 year warranty. You can sell it w/5 years left..
If it sounds a little forward in your system, try a Pass
X250. The Pass is more laid back, but it will heat your listening room up....

Daniel

hello the Yamaha has got to go. Invest in a preamp a placette passive is awesome for the price. I concur with the Conrad Johnson premier 11 amplifiers also.

With the ProAc 2.5's an excellent choice is the Bryston 4B ST. I ran that amplifier with ProAc 3.8's and really was able to enjoy the music. The amplifier was able to control the woofers so that the bass was plentiful and tuneful. The combination also worked because the ProAc's, IMHO, lacked in dynamics and the Bryston, IMHO, was a bit forward in its presentation. Together their individual strengths made up for their individual weaknesses.

I am sure that their are many good choices that you could make. The beauty of the Bryston 4B ST is that you could find one used for around $1500 and spend the other $2000 on source upgrades that could make a greater difference. The warranty period ensures resale value. If you choose to spend more my suggestion would be to find a used Mark Levinson or Balanced Audio Technology amplifier. Good Luck

edge m6m used 3500.00...hard to beat!

Just saw a pair of Aleph 2 monos (100/200 8/4) for only $2800! Can't beat that for a great amp value.
Good luck.