As has been previously stated, carpets are semi-arboreal. From my experience, Irian Jayas are a bit more arboreal than coastals. Jungles also like a bit of arboreal space.

What size animal are you looking for??
Irians grow to about 5 1/2 - 6 ft., jungles to about 8 ft., and coastals to 9 - 10ft.

An adult jungle would do good in a cage 36" x 24" x 15". Coastals in a cage 48" x 24" x 15".

If you are looking for a nice high quality trophy jungle, you can't go wrong with Andrew Hare. He has some of the best jungles available in the market today.

If you are leaning toward an Irian or coastal, shoot me a PM.