i got an 8.1 somethin, and its awesome, skating mini ramps and stuff is so much better than on a super narrow board, and for everything its so much easier to catch and keep your feet from slipping off, my friend has an 8.25 i think, so 8.5 wouldnt be too bad, it would be so sick for bowls and stuff, and if thats all your doin then why not? but you could just go with something around 8 and its gonna be good enough