Weird question, I know. I'm in process of building up a hardtail XC race rig from a single speed. I have a rigid White Brothers and a Fox F100 for it now. Thing is, in order for me to be more competitive, I'm going to need gears. I'm only considering a Rohloff speedhub right now since the bike has a eccentric bottom bracket. Selling the Fox F100 will take some sting out of the $1300 needed for the hub but then that just leaves me with a rigid. I know set up is largely dependent on the course, blah, blah. I'm just saying. If general all purpose racing, use a front suspension single speed or fully rigid with a speedhub in the back?