They'll sound great...they can handle a bit more power and will sound better if you hook up an external amp, however.
and like you advise, i am thinking of getting an amp... any thoughts as to a good one to power those? im only looking to power those speakers and have limited money, just bought a new car, old one was stolen... thanks in advance
Some good amps would be the Infinity Reference 7520a or the MTX Thunder 342. They are somewhat expensive and i'm not sure what type of budget you have... Another option would be to get a smaller amp than the ones mentioned, you could probably go as low as 50w rms and still get a decent sound from those speakers (but would still sound waay better than the headunit amp).