I would stay away from the 3.73's because you wouldn't be getting much out of them over the stock 3.55's for the money you'd be spending. I don't know of anyone anywhere that is running 3.90's. Most people are running either 3.73's or 4.10's...It's a bit of a toss up in the respect that 3.73's aren't enough gear and some people seem to complain that 4.10's are too much...
I, personally, will be going with a set of 4.10's and either a Kenne Bell or Saleen blower, with a goal of about 440-450 at the wheels. I haven't decided which one I will go with though, but I am definitely going with 4.10's regardless.
