[Optimus Vader]

No clue on Hasbro's plans, but I doubt a KOTOR line is near. Hopefully they'll at least repack the 07 figs they made at some point though.

I do have a few suggestions for you though. All are Vintage Collection..

-Sidious (Phantom Menace): doesn't have ball jointed hips, but still probably THE Sid to have if you were choosing just one. Sculpt, robe, hood,.. awesome.

-Maul (Phantom Menace): fully articulated w/ball jointed hips and like Sid has an awesome robe/hood piece.

-R2 (RoTJ): check out his accessories.

-Ackbar: I just really like this one.

-Gamorrean Guard: If you can find any.

-Stormtrooper: Fully articulated.

A couple of Cantina Patrons that I think are very nice figures..
-Walrus Man: removable arm to re-enact his quick ass whipping
-Bom Vimdim: he comes with a glass of blue milk