What size skin should I get for 2008-9 Vokl Gotama 133/105/124 , 125 or 140mm?

I would go with the 125. The majority of the traction comes from the rear 2/3 of the skis. So having full coverage at the tip isn't really useful, plus it's a waste of money and skin material. Also, the gotamas have some pretty good rocker up front, so on any firm surfaces the tips won't even be touching. 125 is the way to go. Plus a the tip of the ski at 134mm, that's a difference of 9mm or 4.5mm on each side. That's less than 1/2 a cm. A really small inconsequential amount, especially considering you want the edge exposed anyway.

I size of the tip, I want only the edges showing, and nothing else, trust me when you get on boiler plate and are side hilling, leaning on the front part of those skis, trying to stay stuck, you'll thank me. I mean really, your only saving yourself 20 bucks, for a product you gonna have for a long time!

I've always sized my skins based on the dimension of the tail. So a 125mm wide skin should work just fine for you (and you'll save some green!). Remember; you'll be trimming off ~2mm on each side for your edges anyway.