We support both classes. Plus more interested would be generated for guys running at large tracks such as Blue Diamond and Jackson R/C. The common theme around here is that guys are getting tired of dish wheels and Mazda 6 bodies. Plus 27T and 19T are the only motors that have true brushless alternatives.
GT2---17.5/27T
GT1---10.5/19T
Plus you will get a lot of cross over from the Tamiya TCS and HPI Challenge series.
One recommendation: GT2 - spec tire. GT1 - open 24 mm/non dish/non Jaco Prism.