Polk Audio D5000.5 or Kenwood XR-5S. They provide the rated power with low noise signal and good THD according to tests I have seen. They're very small, but Polk is a little longer and narrower. Polk as the power and ground connectors on the opposite side from the RCA and speaker wire connectors, while Kenwood has all connectors on one side. I think their online prices are about $350 or less. The Alpine PDX-5 v9 looks interesting, but it's a lot more expensive and there haven't been any reviews yet.