I'm not bashing the Powertech's Dps Capabilities at all. However, I am being logical the tracer missle gives everyone in the raid more dps + the 5% more damage than the PT that you mentioned. To any elitist guild who raids they will take the merc anyday.
If PvP is what your after, the utilities for a PT are amazing. The off tanking, guard, and taunt that you mentioned are great but he is asking what is the best for a Dps class.