RE: buggy differnce
9.5 is an older buggy but in my opinion it can still be competative on a club level. I believe it came in a both c-hub and PBS suspensions. Its also sold as the Ravager now and Violator with a King Pin suspension(worst of the bunch).
The Hyper 8 is the newest buggy and is the cream of the crop. More $$$ but a better buggy as well.