@sozobe,
I think I missed this first time round too... haven't read the whole thread and see you already have a snake.
Was going to suggest a chamaeleon. We've had a few of those, easy to keep, very calming, incredibly fascinating, and amazing to watch feed - and great characters. My friend has a large one at the mo called Darwin - HE IS GORGEOUS.
However, also babysat a cornsnake for a mate and his lizard, but Sesame snake lunged at me so to grab said thawed mouse... and that put me off him.
Have had plenty leopard geckos (beautiful creatures), lizards, beardies... beardies get quite big.
Anyhooooo you're fixed up with a snake now - best wishes to y'all and hope Mo enjoys.
<R was well into his lizards - loved them.>
<deffo no no for the 8 legged thing>