I like the W4S ST500 on my N802's. You can absolutely hammer out the tunes and barely feel any heat from the amp. It is small and light, so easy to store when not in use. You should be able to find one close to your price range.
Recommendations for a "summer" amp?
Living in a hot southern climate I'm considering acquiring a 2nd amplifier for summertime use as a backup to my Pass Labs amp which runs quite warm. Solid state, cool-running, fairly recent vintage (don't want to invest in service) with a used price somewhere below $800. I had a good candidate in storage but I gave it to my brother so I need some recommendations. My system is comprised of an ARC tube pre and B&W Matrix 800 series speakers.