The Onkyo A-9010 is the single best amplifier I've heard for anywhere near the price. IMO, it should be the default answer to the “budget amplifier” question that gets asked so often :
Onkyo Europe - Our A-9010 Integrated Stereo Amplifier,... | Facebook
Yamaha A-S301BL Vs Onkyo A-9010 | Yamaha, Powered subwoofer, Best speakers
A low-cost/high-performance contender: Onkyo's A-9010 integrated amplifier - CNET