Manix, I don't know if I have confused you in other posts, modified buggys with any motor/battery/whatever may sound like a madhouse but runs better than you would expect, racers soon learn that they can/cannot handle the power of fast motors and settle down to a pace that suits there ability, in buggys we know the 3,5turn brushless motors that are used in some TC cars are not for us, you will find secondhand 4.5's easy to come by, secondhand 5.5's and up are not so common or are snapped up quickly. Slower drivers are on the whole pretty good and get off the driving line when they need to, I think you will have a bit of a learning curve, but (weekend looking dryer) this is a good time to start, come spring/summer you will be up and running and know what its all about.
Enjoy