good budget for a distortion... Well, there are a few choices, this are some of the more common ones...
1) Crunchbox
2) Boss DS-1(kinda bread and butter but I might be wrong)
3) Ibanez Tubescreamer (either the TS9 or save up abit more for a TS808)
4) Fulltone Ocd (not too bad, although some might think it's abit too bassy)
Might have better choices, maybe other fellow softies can help...