My main HB is and always has been a combo back, slight lean towards elusive but enough in power to more than do the job inside. It's the best approach to take imo.
I don't want to give away exact numbers but the main 5 (strength, vision, carrying, speed, agility) are all at 45+ and I have at least 2 in each SA on both trees (with some up to 5-6). His numbers are a bit inflated this year because we've played some gutted teams but he's been one of the leading backs in USA AA#3 every season.
http://goallineblitz.com/game/player.pl?player_id=65573