I can get into this one for $650, maybe $625.
Hey David!
Over here on the wet side I'd day $625 is a fair price--you can shoot it and still get your money back if you decide to part ways with it. (Heck, if you lose $25 after owning it for a year, you got to rent it for $2/month!)
I just wanted to comment that moon clips are a pain. I don't know what your experience is with them, but mine hasn't been good. Moon clips can be delicate and temperamental. When they work, they're awesome. If they get bent at all, even a smidge, you can have brass wedged into your chambers and you have to tap out pieces with a cleaning rod, pencil, piece of dowel, or whatever you have handy.
On the plus side, shooting .45 ACP out of a revolver that size is a breeze. I have the .45 Colt / .45 ACP Blackhawk and am always impressed as to how that gun soaks up the recoil. I shoot some fairly stiff loads out of a 1911 for bowling pin shoots and the recoil is noticeable, but out of the Blackhawk, those same loads are just cupcakes.
Good luck in your decision! Post a pic if you buy it!