Hmm, I think I have enough stuff in the garage to build 3 karts.
If you have an old chassis, Brad has one of these kits on ebay:
I believe it includes clutch mount, pipe everything except the axle sprocket. I believe it is a much better engine and better deal than the ARC kit.
LO206 is the way to go. Stay tuned to this thread on EKN. Rob Howden is trying out the LO206 at the Rock Island Grand Prix. http://ekartingnews.com/forums/topic/ekn-lo206-project-racing/