Agree with Hybridfish; had a nice young NBTS (suspected male) before; he wanted absolutely nothing to do with me, but still wasn't unmanageable at all. Ate a wide variety of foods (but was rather picky when it came to processed protein), relatively active, not impossible to handle (once picked up and moved out of enclosure, he calmed down a fair bit), can supposedly tolerate temps down into the 50s (F), supposedly can go up to two months+ without food, two weeks without water (last three points are for reassurance; certainly not a etc. One of the easiest "medium" sized lizards I had the pleasure of caring for; seemed quite intelligent as well- good perception of surroundings and frequently interacted with various things by moving them about. Unfortunately, mine suffered from organ deformities, likely because he was an F3-F4 (can't recall which) runt and eventually passed after two years.
Even if someone offered me a free CB uro in the next hour, I'd still pass; they're rather...odd? captives, and not exactly the best one. Will tack on another $30-50 to your electricity bill every month or so due to all the necessary light, and supposedly do not take well to smaller enclosures. Their herbivorous diet means a new pack of salad mix and some fruit/veggies every few days, which might not be the most preferable (unless you like salad, of course). Inability to find true CB dispar easily will be a slight struggle, though probably not as major an issue. I heard they aren't the most fond of handling, especially when WC, but will tolerate it after some time. Not a lizard I'd let free-roam for any considerable length of time, though. A bit like a tiny, active adult tortoise that requires higher temperatures.
Don't know how much I'd recommend acanthurus, but it's difficult to deny that they're great medium-sized lizards if sufficient resources are available.
