need help with tires and rims

i've got a couple questions about some tires. here's what i'm getting:

pro comp 7005 17*8 wheels
5100 shocks all around with ome 884 coils and an aal in the rear

so here's my questions.

1 what kind of offset would be good, i dont want the tires to be sticking out past the fender

2 what size tires? 275/70/17 or 285/70/17, for some reason the 285's are about cheaper??

any rubbing issues with either tire?

thanks for the help