Psion
Adventurer
NanocTheCivilized said:D&D Players Handbook 4,448
Serenity RPG 25,186
Incidentally, I did a sales comparison also using Amazon's numbers back in December. That number's actually slipped quite a bit. It was like 4000 (but at the time, D&D PHB was still better, like 2900), but still, it was beating every major line I could think of but D&D, with M&M taking a tidy third.