Im looking to spend up to $400 on a good head unit, and it needs to have the ability to play mp3 files. Ive heard eclipse and alpine are good, what models should i be looking at and where can i buy them online?

As far as my future set up, im planning on replacing all the stock speakers with new aftermarket ones and running an amp to them(any speaker or amp suggestions?). But before that i want to get a solo baric L7, can anyone reccomend an amp for this sub(or reccomend a better sub for the same price)?

btw my car is a '95 integra GSR coupe. and im pretty sure i have 5 1/4 in speakers all the was around w/ a tweeter in each door.

thanks