If you're specd for stunning, you'll be using weighted weapons (bludegon), so Hvy Pick is out. Warhammers will be your weapon of choice.
As for stats, you'll max out str fo improved DC
As for feats, standard kensai package and of course stunning blow, improv trip is good to have also since DC will be good
As for enhancements, full kensai, ftr str, ftr and racial tactics
As mentioned by others you should be able to get mid to upper 40s DC easily. That should work on most trash mobs norm-elite. To really have high sucess rate in epic lvl quests, you'll want to shoot for mid 50s.