I have 7" fronts and 9" rears under my GT flares. 8s will fit up front or all around, as I've seen. I went with 16" Fuchs. EDIT: most important decision is early vs. late offset for 5-lug wheels, since that also comes into play for the rim diameter which can limit your tire choices somewhat.
Some variation in tire tread width can be fit on those wheels, so I'm not going to list them all 'cos I'm lazy.