Why has noone suggested the Pioneer amps? I find them reliable and great sounding per buck, and I'm comparing to Audiobahn, Power Acoustik, Sony, and Xenon series, although the Xenon series is MUCH better, it also costs more.
I also bought a cheapy PS4-240 (35x4 @ 4 ohms supposedly) Power Acoustik and it runs fine for what she needs, but it picks up alot of interference easily.
As far as speakers, look into Phoenix Gold Octane R components or if you can get your hands on them, the RSd line components. The Octane R's are nice for a budget system, and the RSd's have been highly praised for their performance, even at their cheap price. (roughly 100$ before shipping online).
So...
Speakers: PG RSd/Octane R 100/115$ after shipping
Amplifier: Pioneer GM-5300T
http://www.cardomain.com/item/PIOGM5300T 150$ after shipping
=265$ or so for speakers and amp that is more than able to push them perfectly.