Actually Steve, I think it depends mightily on what kind of riding you're thinkin' of doing with this other bike. Sport riding? Sport-Touring? Touring? Dual-Purpose, or what have you?
Now, if it wasn't goin' to be for any long-distance duty at all, then I'd buy a two or three year old stock Bonnie or T100 and then I'd customize that baby into a StreetTracker, WHICH you could do for probably 1500 bucks extra, and still probably less than a stock NEW Bonnie out the door!
And THEN if you'd really like to go a little crazy, put a big-bore kit on it a bit later.
(Oh yeeeeah...and you think you get folks walkin' up and admirin' the SM now, do ya?!...weeeell, that baby would have 'em droolin' even more when you'd ride up, 'cuz ANYBODY with a lick o' knowledge about motorcycles LOVES a StreetTracker, dude!!!)