how about rhacodactylus geckos? they would do well in the setup you are describing. they get about 4" SVL. they are better known as crested/eyelash geckos and gargoyle geckos. there are others too but they get more expensive and harder to find.
they are nocturnal but can be seen sleeping on foilage or on the glass during the day.
for food they can thrive on T-rex brand meal replacement powder. you mix the powder with water and it congeals into a paste. i bought a 30$ tub 6 months ago and i still have half left (for 2 geckos). you can feed them crickets if you want, but with this diet they dont need them after about 6 months of age.
the cresties run from about 45$(unremarkable tan morphs) to over 200$ for some rare morphs. the gargoyle geckos can be found from one to two hundred dollars.
they dont require uv light and usually room temp is perfect so a small light is good enough for basking but not vital
they are prolific breeders so if you get a male/female pair you can look forward to about 10 to 20 eggs a year. the eggs incubate at room temp.
these are some of the easiest and most rewarding herps to date and thier popularity is rising (herps in general are getting more popular
)i have 2 gargoyle geckos and just got my first egg out of the nestbox last weekend. i would highly recommend these guys 
check out the rhacodactylus forums on here under gecko forums. there is a wealth of info over there.
here is a pic of my male enjoying some baby food

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1.1 Gargoyle geckos
1.1 leucistic leopard gecko
0.0.1 asian golden tree frog
1.0 oriental firebelly toad
0.1 european firebelly toad
1.0 albino betta
1.0 orange tabby
0.0.1 asian painted frog
1.0 broad headed skink
0.0.1 fowlers toad
1.1 red eyed tree frog
1.1 red eared sliders
476.769.47 feeder crickets 