grimunk, with reg it doesnt rly matter that much what build you go for.
if both teams have decent players (read the start of this sentence again just to be sure), then the team with reg is going to be 1 man down in any serious fight if the other team has the typical ub/ereb/oak
same goes for TB. dont get me wrong i like TB alot, but if one team has the uber DG's and the other has 2 ubers and 1 TB, again, assuming both teams have decent players, then my money would be on the all uber dg team winning 99 times out of 100. same for reg and qot.
sedna, rook, demon assassin, occulus i would say are midclass DG's but one thing that makes them non-uber is the fact that they cannot escape in a sticky situation (yes warpstone, yes cloak of night, but those are big sacrifices to make).
oak shields, ereb mists and swarms, ub just kills everything so he doesnt need to run : )...well usually.