They are very quick, dont like to be held, if your looking for a handable type pet. But they are a cool arboreal lizard. And they look for you, very inquisitive !
The males are beautiful, females are a duller greenish/brown but cute.
They thrive better in a tall set up, they love to climb. I acually have my pair in a 65 gallon reptaruim, you could certainly go smaller, I just thought they would love all the space and feel more free.
They use every inch of the screened cage sides top, everywhere.
They could live in a 30 gallon with nice branches to climb, and do well. A couple crickets a day, but do enjoy supers, mealies or waxies and small moths, for variety.
My female is pregnant, it takes 9 months, they have LIVE birth which is pretty neat also.
Good luck with your decision, and I have to agree dont try to scrimp on food, if you have to, hold off , they will be there when you are ready! 
The Grinch, Male Emerald Swift

-----
___
Eve