I wouldn't trust some of those lesser known names. I have an Alpine 40x4 amp and I want to upgrade it, so I also want to know where to find CLEAR reliable amps like Alpine for good prices [under 500 bucks] Would it be more sensible to just get two 2-channel amps?

I plan on running an Infinity component system in the future. That is why I ask, because the RMS on those things is 90watts. I would need something that'll put out at least 70watts RMS per channel. I hear Mmats makes some good amps, but that could have just been my friend's BS.