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 A-9010 Stereo Integrated Amplifier - The Music Room
Onkyo A-9010 (UK) Integrated Amplifier Review | StereoNET United Kingdom
Onkyo A-9110 Review | The Master Switch
Onkyo Europe - High-current WRAT power at its most affordable price ever: Our new A-9010 Integrated Stereo Amplifier is engineered with sound quality as the foremost priority. Wanna see more details? http://bit.ly/1CgJJJy