Were you looking to do a homemade enclosure or buy one that was already made? Were you thinking of sticking with the glass aquarium type enclosures or going with something fancier like something from cages by design? If you are looking for something really facny and have a large budget i would try Cages by Design.
I dont have a pic of my set up right now cause my digi cam is dead at the moment but basically its a 90gallon tank with a doublewide cinderblock at one end set up on a couple of bricks to provide her a "cave" and also a basking spot and a whole mess of branches at the other end that provide a variety of different basking branches.
My female is pretty large (20inches 672grams) and the 90gallon suits her just fine. If you are going with glass aquariums i would say a 75/90gallon would be good. The only thing i would say is 75g might be better because its not as tall and therefore its easier to heat and light.
Good luck!

-----
0.1 Bearded dragon
0.1 mexican Black kingsnake
1.1 Leopard Gecko's
0.0.1 Tokay Gecko
1.0 Blue Tongue Skink
0.0.1 Reverse Okeetee Corn
0.1 Anerythristic Corn
0.0.1 Red Tegu
0.1 Bullmastiff
4.1 Cats