I raised G stentor/smithii for a few years. Treat them like tokays and you'll be okay. They're communal and care for the eggs and babies. If the enclosure is big enough, you can keep several males together without harm. They'll form a pecking order. My 3.4 were in a 90 gallon tank, lots of caves and branches. Eggs were glued near the light most of the time. When there wasn't any room left htere, they'd be in a cave. The adults would bask for a while, then run to the cave eggs and sit on them, transferring body heat to them. When I added a UTH to one cave on the floor, they started using it for egg laying.
THey're extremely vocal, LOUD, very loud. I had them in the basement herp room but could clearly hear them on the main floor.
A lot of the green eyes available aren't smithi/stentor. Most of the North American smithii are really G. siamensis. The care is basically the same, no need to worry, but the siamensis don't call as loud.
You can check the GGA archives for info and discussion on Stentor/smithii Just this past April there was some discussion about them
http://lists.gekkota.com/pipermail/g...il/003818.html
Oh... they're NOT like cresties. These guys have TEETH and can take their pound of flesh just like a tokay can.