A lot of guys like the Metal Zone by Boss, it doesnt do it for me but it does have a fairly wide set of crunch tones. Check out E-Bay for a Line6 DM4 (gold stomp box) - it has pretty much every pedal built in, some great tones and some not so great. Of all the pedals I've had , that one is the best. My personal favourite of the basic pedals is a Tube Screamer - great tones for lead and you can also get some solid rhythm.