Running Back Preference

I run a veer-based offense from under center (old school). I need to have a RB who has enough power to push a pile a bit, but has to have enough burst and quickness to be effective. I don't need a 4.4 type guy to run my offense. I can use 4.9 and 5.0 guys if they can get out of a stance well, and have good enough agility to run cutback effectively. Most of all, I need kids who are willing to not dance until they get past the LB level. If I have a "skat-back" player who just cannot get himself to put his nose down and hit the hole at 100 mph, then I have to use him as a slot.