MrFerretman: I am of the opinion that there is no "suitable" arboreal to start with. If you are looking for something that is pretty and you don't wont to touch it, then a Poecilotheria species would be suitable. Do however agree with you that P. ornata is definetly not suitable as the one I have escaped his confinement about three times. The thrid time was the worst, he dissapeared for a few hours and then he popped up on a bookshelf.
People are generally biased towards the Trinidad Chevron and the Pinktoe but at the end of the day, it all depends on what the person is looking for. Whatever you do, don't go for a Thrixopelma ockerti right off the bat. They are the spawn of satan, only surpassed by Satan himself, the Stromatopelma calceatum.
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