In my civic I have 4 infinity kappa 63.5 speakers (4 Ohm, 75w rms, 225w peak). My headunit is a Pioneer DEH-P7400MP (50X4). Im looking to get a good 4 channel amp to power these speakers. I really dont have a budget so I will consider all choices. Basically I want something that will give me clean, crisp sound when I raise the volume. Any recommendations? Thanks.