I recommend that when i doubt, go big. Remember that these animals are from a rainforest habitat and usually are found living on the branches of trees. They will do better if they have alot of space to climb and move around. I have a pair in a 3'H x 2L' x2'W and they seem to be very happy.
I also try to have compassion for the animals i keep, always trying to imagine what it would be like to be living in a cage all my life. If i was a gecko i would want more space instead of less.