Help me pick a power amp

I think I have a old yamaha amp that's worth 200 ish

I have no clue what else is good in that price range...... Adcom makes great affordable stuff. I have a gfa-5500 that is replacing the yamaha

I have a B&K with my Paradigm speakers and love it. Sounds great and never runs out of steam.

There's an NAD 214 for $150 on Agon. That's a good 80 watt amp and that's conservatively rated imho. I have the NAD 317 integrated which is basically the same thing and it's got a lot of power.

You might want to look at a Parasound HCA 750 or 1000. They also can be strapped into mono unlike the Adcom's and that allows you an upgrade path.

These are readily available on ebay: (http://cgi.ebay.com/David-Hafler-Model-DH-220-stereo-power-amplifier-220_W0QQitemZ160392533002QQcmdZViewItemQQptZVintage_Electronics_R2?hash=item255823d40a), and sound much more like music than most of what's out there, in your price range. They can be strapped mono, and there are companies that still offer upgrades, should you desire to go that route in the future. The one in the listing is either a later model, or has had a number of caps replaced with polypropylenes(the blue ones), that the early models didn't have. A VERY conservative 110 W into 8 Ohms(continuous), and can drive a 2 Ohm load without any problems.