Save your money, forget the Vision, and make your own enclosure. Visions don't allow for proper substrate depth, there is too much ventilation, and are too small. The largest one I believe is 96x30x24. Build an enclosure 96x72x48 instead. Put in a foot (or 2, preferably) of dirt, provide a hot side and a cooler side, and provide plenty of places to dig, etc.

That is a large, active and intelligent lizard you have there (his beauty goes without saying). Respect him as such.

Chris