I wonder what channel amp I would need to power 4 door speakers, and one 12 inch sub in my 96 accord.

Any suggestions???

 

depends on the speakers and sub you are installing.

but a 5 channel amp can do what you want. there are several on the market, none under $500 so hopefully you have the budget for them.

JL Audio
Kicker
Boston Acoustics (Crutchfield has a killer sale right now)

are a few to look at for starters.