I was thinking of buying 527 in a staggered set up with 18x8.75 front with a 215/40/R18 tires , and the rear 18x9.75 with 225/40/R18. Or my other option is the xxr521, Im still debating if I should get machined walls or not, but for the 521s the fronts would be 18x8 and the rears would be 18x10. Can you guys help me out !!