Well based on those rules, we'd both be in GT open class.
I see the "no foams" rule for all GT classes
, guess I won't mess with any foams for now.
My real concern for tires is to have something that works and is cost effective. I want to keep the operating costs reasonable. I don't mind spending on upgrades b/c they last, but spending on "disposable" items like tires gets old fast. That's been my biggest beef with my on-road cars, the cost and frequency of replacing the tires, dropping $40-50 for a new set of tires for every half gallon of fuel is getting old. If the fuel/tire costs get too high, I'd probably stop racing.
Operating expenses is one reason I'm starting to look at 1/5th scale gasoline powered vehicles. They cost more upfront but I think it evens out in about 6 months of operation and then are cheaper.