This is for a friend this time, not for me. Anyways, he just bought an autotek SM1-1500 (street machine), pushin 375 rms in 4 channels at 4ohms. Lookin for 6.5s in the front and 6x9s in the back, tryin to spend somehwere around the $200 range for each.

Rears aren't necessary, there aren't really any decent 6x9's available, and he should return that amp and get a real one.

In particular since that is a one channel sub amp and won't power 4 speakers.

Try some Image Dynamics Chameleons.