The only species that strike me as filling that discription are like the shingleback skink(rather spendy in the us) and maybe some of the helodermids(rather venomous in the us) You could always try one of those tame Tokay geckos I've read about..... And while I do really like the roughnecks they aren't good as one's first monitor as
they are somewhat flighty and a bit tricky in acclimating at times.
guy