I vote for a draft. While both methods may have their flaws, the draft's flaws aren't as troubling as the latter option. A draft creates fairness and prevents the construction of super-teams. Like Caite said, it would be wise to have those who sign-up for PXFIRE message the PXFIRE leaders if they don't wish to work with certain individuals... and it would have to be a legitimate reason (gotta' learn to suck things up sometimes).