As for an amp, i just hooked up the Kenwood KAC-8401 amp up to my 4 infiniti kappa speakers and I love it. I would recommend it to anyone. It is really powerful and looks cool also. Its got 640watts and an internal fan that pumps cold air out of a vent on the top of the amp.
Also, if anyone is going to buy electronic stuff online, Id recommend this website:
I bought my amp and a sub off them and they were perfect.