Pyrotech powertechs - these either have huge damage or some bugs with agro because they always agro everything off me unless I put a guard on them. Mercs do very good damage with magic missiles but arent as effective if a lot of movement is required. Everyone else arent worth mentioning (or I havent met good ones, anyway combat log is required).
I play a PT dps, and I really do think I would be topping meters against others in my guild, even though I am in mostly mid range pvp/pve gear. And we do have some highly geared pve players.