It's good to know that another board-user can hook you up with better prices than those you find. That's one of the few reasons why I keep coming back here.
As for your question, i think you could go with that audio setup you just described except that i believe that the amp can hook 3 speakers on 2 channels. (wiring diagrams anybody?) i'm not quite sure though, so dont try it until someone else tells you if there is a certain wiring diagram or if it sounds like crap.
i have a rockford fosgate 800Wx4 amp. it's pretty good, but i've heard a few that are better... and i know it should because it's hooked up to a pioneer HU and two 15" kicker subs (enclosed box
)