Taris. Because the place is really the Coruscant of the Outer Rim, and it constantly changing, no matter how insignificant is the stuff you do.
"Hey there and welcome to the Equipment Emporium!" Kebla's welcome you.
"I'd like to see your wares." You
"Sure thing... Eh, just so you might know, the Sith have confiscated all my speeders and ships since you've eaten that Dianoga-soup on Javyyar's... Well'p, I stil have a nice selection of permacrete detonators you may use to save Matrik's ass!" Kebla's.
Then comes Manaan. It's actually the best damn place for actual RPing and a unique place: Sith and Republic co-existing.