Both the peach throat and blue tailed are in the mangrove monitor complex, and share a lot of the characteristics of the mangrove monitor. They can be beautiful and rewarding but like the previous poster said, they are not for the beginner. I still have a faint scar on my left hand from picking up a blue tailed the the wrong way and it was able to turn around and nail me. And it was a relatively tame one - they're just not monitors that take well to handling.
Your experience with the pythons limits you - most of those do become tame the more you mess with them, unlike other species that need to be left alone to thrive. What works for your big constrictors may not necessarily work for the monitors, especially when it comes to 'taming' them.
If you really want a tropical monitor, go uglier but sturdier. Brown and black roughnecks can be rewarding if you put the time in. For smaller than that, like previously suggested, the ackies are a great way to go. You're just not going to find a tropical, pretty, tree dwelling monitor that accepts regular handling with grace; it's not how they work.
Check out www.proexotics.com. There's some great information there that'll help you decide what you can and can't do.
~Jenny
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"We call them dumb animals, and so they are, for they cannot tell us how they feel, but they do not suffer less because they have no words."
- Anna Sewell (1820-1878)