Advice on upgrading HT system with 5ch power amp

In your price range it's going to be hard to beat a new Outlaw audio. Check out their website. Basically rebadged ATI amps and a great deal.

Check out the B&K line - they make some 5 channel amps as well as 7 channel. Very clean, solidly built in the USA and available used - not quite the wattage you are looking for, but in real world terms they are better then most. Plus includes full function remote and solid front end.

I'll second the B&K amps. Their 5 channel amps are excellent sounding and a great buy. The other thing I like about them is the form factor - 17" face, and not too deep. And they do have a number of models with the power output you're after.

They will put out heat though so make sure your rack has plenty of ventilation. This is probably true of all of the models you're consdering though.

I had the 125 W/C model, and it was gutsy and musical. It may be as much power as you need, but if you don't want to mess around go for the 200w/c model. They're available used well within your price range.

To make your life easier, get the rotel rmb-1095. You can find them used right around your price range. Hard to beat.