Do you know anything of the history of this tarantula, as in where it came from, habits, etc.? It does indeed look like Aphonopelma anax, and it's certainly a New World species, since it's got urticating hairs. My A. anax looks just that, so I'd go with Aphonopelma SOMETHING, but many US spiders in that genus look very much alike. Knowing where it was captured would help.
I could be seeing things, but I think I see a tibial spur on the on the leg to the left (and a very blurry one on the right). If that is the case, and it is a MM, good luck finding out what it is. Many males of the aphonopelma genus change color upon maturing. I think figuring out where it was collected would be the most helpful. Good luck!