My two tanks have over 400 toughness and all my DPS are over 400 hit. It is very easy to gear up in Rift by doing world events and dailies for IS (infinity stones). There is also some very cheap gear on the AH that is really good - particularly rings, belts, and helms.

If you want some help getting into TDQ, just let me know. We could easily run a couple of teams (5 of mine, 5 of yours) twice. Would be fun and challenging to try the two 20 man dungeons at some point as well if you are interested.