It seems pretty unanimous that the Christopher Reeve Superman was one Hot Toys figure that people were willing to buy sight unseen. Yes, the pictures helped sell it, but really, based on the concept, this was one figure where the character choice and company reputation were enough to sell me on the figure.
The Barnes from Platoon was another one where I wanted it as soon as I heard about it, and the pictures (if bad) could only serve to make me not want it.
So which characters have they not made yet that you would want automatically?
I was thinking about this the other day, and the only one I could come up with is a Lynda Carter Wonder Woman. For anything else, I'd need to see a lot of pictures first.