PC and MAC CS3 format Q
 

I am pricing out to editing computers, one needs to be a PC, the other can be a MACPRO. My question is:

1. Since I will be using CS3 on both (if I go Mac) what problems will I run into shooting projects back and forth between the two platforms?

2. Does CS3 use the same AVI format on both?

3. Is it worth it to just do two PCs?