Yea, what Lasrix said.
However, if you want a sturdy, good computer for about any use, for about $800 (more if you want better, but you won't need it) I can give you some good links (for the whole computer)
Thats pretty hard to come by for 600 bux if your starting with absolutely no parts. I think its probably doable tho. I could do the reasearch on it but im too lazy.. And that probably would not include a monitor.