Shelton Benjamin obviously has a BIG dick, and I think Rene Dupree has a huge one too, with the way he always hung low in his trunks (and he has a huge ass, too).
Hottie Mark Jindrak aka The Reflection of Perfection always looked like he had a huge cock, too (he's wrestling on the Mexican circuit nowadays, and has done some Chippendales-type dancing down there).
Cena, like Dupree, has a HUGE ass, but I think he's probably just average in the dick size dept. Hottie Edge never showed much bulge either, but I would never kick him out of bed. I think Shawn Michaels (who also has a great ass) has a big one (probably bigger than his buddy Triple H's). Randy Orton is probably normal-sized.