Some cliches come to mind : Life is short, A bird in the hand...
Basically, if it were me I wouldn't do it unless I was certain I could get another one set up the way I want without paying out the money I'd make on selling the first (which would make the whole transaction null).
Sure I could get one later, but having just got ours I am enjoying it too much, and going back to a bigger car will rule me out of those fantastic small spaces again ;)
PS; If you are in a state with sales tax, don't forget to factor that in.