Well, that all depends on what you like and your level of expertise. Basically,
arboreal geckos like solid things to climb on, so they wouldn't like climbing on the mesh. If you've had quite a bit of experience and have no problem keeping up with the strict care requirements, you could keep large chameleon species (Veiled, Panther). Though you'd have to upgrade the cage size as the chameleon grows. Turned over on it's side so that it's terrestrial rather than
arboreal, you could keep several leopard geckos or African fat-tailed geckos together (not both species w/ each other). You could also keep a bearded dragon in this size cage for a short while until it outgrows this cage. I think you could also keep a Mali uromastyx in this size enclosure their entire life. Don't take my word for it, I don't know much about them, such as care requirements and size, but they seem smaller than beardies from what I've seen.
It's hard to know what to suggest for this type/size of enclosure because you haven't really given us much to go on.
Bry
_________________
"Silly kids, rabbits are for snakes!"
"I got a pet cactus in the bathroom. But we don't got nothing to say to each other." - Walter Matthau