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As for tire advice, all I can say is different tire brands and makes all have different standard width, and even rim width will affect tire width. So a set of 245mm Nitto NT-01s mounted on 8.5" wide rims may actually be WIDER than a set of 275mm Goodyear Eagle F1s mounted on 8" wide rims.
The only thing I can suggest, is go to the local track events, talk to guys with various rim size/tire sizes and see how it works on their X,XXX lbs car, then start with a baseline to work from.
I've been riding on 245f/265r R1-Rs shod on 8.5f et38/9.5r et25 rims for nearly 2 seasons now with hot pressure right at 38psi and it seems to work well for ME on stock suspension. So take that for what it's worth.
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