VaEBP

im about to start doing suspenison work on my g35. so far i got my rear camber/toe kit and the springs will be here on wednesday. im looking for a front kit. with the kits that have the ability to adjust caster, im finding that people at running into problems with the arms hiting the fender. it seems that people who run the non caster ones are ok. my question is how important is caster for tire wear and as far as the suspenison total?