One of the best deals for a bass amp would be either a Eagle (John Iverson) or EKSC (rebuilds and new by former Electron Kinetics tech). Both stereo (2 or 2A) and mono (400) versions are available used for great prices.
While the Eagles/EKSC amps can be outstanding full range on some speakers (I've never heard B&W 801s sound better), their best performance (my opinion here) is in the bass range. This is why I recommended them. So thanks to Steve for reporting on their match with the Emerald Physics. I've never heard that so wanted to make my suggestion clear.
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