Emotiva.com has some very nice amps that are quite reasonably priced and come with 30 day trial, free shipping, and a 5 year warranty. The XPA-200 (150 watts/ch.) is well within your budget at $419...
http://shop.emotiva.com/collections/amplifiers/products/xpa200
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http://shop.emotiva.com/collections/amplifiers/products/xpa200
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