Just a few I can suggest off the top of my head:

Leopard geckos: Small ( a foot long or under...usually unser a foot), don't climb glass, usually very easy to handle, and very easy care.

Crested geckos: about a foot long, they DO climb glass, they're also easy to handle. THere is a little more involved in their care than a leopard gecko but they're still pretty easy.

Bearded dragons: friendly, pretty easy to care for, though the setup can be pricey (I know you said money's no object, I'm just using that as a comparison to the other two)

If he really likes the LOOK of the iguanas, Chinese Water Dragons are similar looking but much smaller (I think they top out around three feet including tail) and generally friendly little guys. They still need a sizable enclosure, but not as large as an iggy.