whats the between the hyper rtr and pbs. im looking at buying the hyper 7 pbs cause i can get a good deal on it new. but i wnana know if theres a difference between the two. ill be on the tracks mainly so i was wondering if this would be ok to buy for that purpose. might eventually get into racing once i get better forsure. but i wont be doing any pro racing yet. let me know what the difference is thanks.