Brushless would be the only way I would race 12th scale-unless I was getting paid then I may go brushed-but since I'm in it for fun(competitive fun) at a club level(I do not have the time or money to race Big races) I Totally agree with John!
I beleive that by the time we have the capital city carpet challenge there will definatly be a mod 12th scale class.(hopefully sooner.)