Jal5,
That sounds like a reasonable price for a used GP in good condition. They are strong guns. I prefer the larger bores, not to extend my range but to increase the penetration. Even if you have a 460, it takes many rounds and a lot of discipline to hit the vitals much past 50yds from field shooting positions. I've hunted in Ohio with a handgun since they allowed it. There are many people who consider the 357 as minimal or even not worthy as a Whitetail gun. My son just got the fever last year and has a 357 Blackhawk. We developed a load using a 200gr. WLN bullet from Cast Performance and I've never seen any other bullet penetrate from a 357 like this load does.
Graybeard and some others are correct in that shot placement trumps power and bore size every time on Whitetail. Here in Ohio they have changed the rules on handgun hunting over the years from only 5 calibers that were legal, to 5" min. barrel, 357 or larger and must be a strait wall case. I called Eric Lane from Perry county to confirm this change would include my Lone Eagle in 444 Marlin, and it is legal. Just like earlier posted, he tells me that most people ( read macho ) who buy these cannons use them one season and are back out with their 12ga. the next year because they will not or can not put in the practice to hit with them.
If you end up getting this GP and would like a starting load with the 200gr. WLN, let me know as I think you would not be under gunned in the least.
Good luck with your practice, Tim.