16-gig DDR3 arriving on Saturday; time to start branching out?

I cannot decide if I want to keep running my various (2)'s, add a third, or take the deep plunge into quad-boxing. Leveling up in WoW was more of a grind; with my companions I find SWTOR having more immersion than grinding quests and dungeons, and while granted, running with (2) more accounts will make all the heroics a breeze, I am not convienced that SWTOR flashpoints are box-friendly enough to run within the level range.

Currently my Marauder/Sorcerer are blasting through stuff, and able to run flashpoints by joining groups; decision point incoming.