Need your opinions on this audio stufff...

Okay, so I have a '99 civic ex, and I havent put in a system yet (I dunno whyyy, haha!), but now I'm gonna...so this is what I'm thinking. I'm on a budget, so...

Pioneer 3500 headunit
Infinity Reference speakers (6x9's and 6.5's)
and prolly a 4 channel amp, but I dunno what kind, my bro's lookin into that...

I'm not bothering w/a sub right now cuz I'm not too worried about the bass, I might consider it later. for now i juss wanna improve the sound quality from the stock speakers.