check out some alpine amps... and if you have a dealer near you, also give Boston Acoustics a listen.

Believe it or not, the Profile Clarus amps are really good too, great entry level amps with good warranties!

What model accord do you have? I'm guessing since you have 6.5's front and rear you have an LX or DX... as the EX and SE had 5's in the front and 6x9's in back.
The 4th gens never had dash tweeters... but if you are to get components, a good place to mount the tweeters is in the top of the door panel, a few inches in front of the door handle.