I went from my stock motor/swinger/carbs etc. (had t5's) to a stock stroke cub setup for about $1850 altogether for bigger carbs, intakes, swinger, carrier, and chain. My clutch has been holding up fine and I have no problems shifting it. The only thing left is pipes (shearer's or cpi's) and I'm going to wait for a good price on them for around 3-400 bux. I'll find it eventually.
My cub flat out rips too. Its great for climbing, duning, racing, I haven't done any trail riding with it but I think I would have plenty of fun with it. You have to stay on the throttle and clutch it to keep it on the pipe sometimes though, there is NO bottom end. It is gutless down there. Otherwise I love it. I don't regret getting it at all and am glad I did.