Recommendations for power Infinity Kappa 9's pease

[Feanor]

At 500$ there is no amplifier on the market expect the HCA2200 that can drive such low impedance loads the Kappa 9's will visit.
The guy doesn't want to spend more than 400$, so I think a better suggestion like the HCA2200 in that price range doesn't even exitst.

Its not the most musical amp, but it works....

Or maybe there is if you're will to consider a pro amp, e.g. this Yamaha P2500S, here.