Lots of different options on cages, chris is right on with the size recommendations for adults. A really big female jungle might want a 4 footer cage though.
a 3x2 minimum for jungles, and I wouldn't go smaller than 4x2 for a coastal.
They will most of the time appreciate height, so I'd go with 24" and fill it up with thick branches. If you go with AP, they can install a shelf for you, which my jungle loves.
MH
Who the hell is Pat?
"Pattimuss doesn't run, he prances most delicately, like a beautiful but sad fairy, winged and capped, curly toed shoes on each foot, dancing on dewdrops while lazy crickets play soft music for him to keep time by...." - Wes