I have to agree on the internal amps. You just cannot squeeze a high-performance amp into a DIN sized HU and still have room for the radio and cd components! It's a simple matter of physics.

I didn't mean to jump on anyone, it's just that I get irritated when someone says there Pioneer HU is the best and that Alpine or Clarion suck. That is just not true. Facts are facts, and opinions are opinions but you can only change opinions. I'm sorry I'm ranting again!

The point is, if you want "gee-whiz" features get whatever you feel has the best ones, but if you want top quality sound reproduction then the previous statements have it covered!