Usually Orc isn't out of stock and Chronos stays in stock for a small while. Gladiator goes almost immediately, so be ready.
However, I'll tell you right off the bat that if you already want to edit your character, pass it off until later. You'll get a lot of TC by the time you reach Black Belt (or even Brown, if you spend a bit of time in Tourneys), and that TC you saved up can get you a bunch of textures or one expensive color.
Of course, it always helps to pay real money if it matters that much to you, but winning matches is really the way to go.