Small and arboreal?

[Will0W783]

Yes, get the book "The More Complete Chondro". You cannot go wrong with that reference. It's a wonderful book. As for whether to get a GTP or an ETB, care is pretty much the same for both, but literature says GTPs tend to tolerate lapses in perfect husbandry a bit better than ETBs. However, I have 3 ETBs and 2 GTPs and my emeralds are far more bullet-proof. I have never had shed problems, except for one time when my misting system broke and I didn't notice it until the evening. My emeralds poop well and are active and bright-eyed and happy. Emeralds (ETBs) do tend to be less active than GTPs and so can have a smaller enclosure per size of the snake. People say emeralds are very aggressive, but mine are tamer than my GTPs. My 3 emeralds are all LTCs, but captive bred are better if you can find and afford them. However, properly established LTC specimens that have been treated for parasites internal and external are usually just fine.
The best perches I have found for either species are 'scorched' PVC pipe perches. They are not porous like wood so they don't harbor parasites or mold, and they are not slippery once treated. What you do is cut the pipe to appropriate length for your cage (you want a diameter that will cause the snake to coil around it and have its front and back coils just touching) and then you get an acetylene torch going. Clamp a wrench on either end of the pipe and wave it through the flame of the torch until you see it turning black and brown. It will smell awful, but will become slightly malleable. While it's hot you can twist it, crimp it, bend it, whatever you want to do. It should have a brown, crusty look to it as well. When it's got the shape and such that you want, dunk it in a bucket of cool water. Finally, scrub it down with dish soap and a brillo pad to get the residue off and it should end up looking quite a lot like a fake branch. The texturing helps them hold onto it and it looks good and is quite easy to clean. If you google scorched PVC snake perch you can find a good how-to video.