I just purchased a set of wheels/tires from John Purner. The car is a 94 RT10. According to John, the best course setup that is streetable is the stock 3.35X17 on the rear and a 3.25X18 on the front. The fronts are a lower profile (smaller sidewall)
The advantages are the improved braking (fronts don't lock up as early), improved turn-in response and the aggressive look in the front. For those interested, John can and will answer any questions on tires or traction. He is also doing the majority of the work inhouse now. The new wheels are a worth while addition to any year Viper.