Personally, as much as I LOVE single action revolvers, especially the Super Blackhawk, it's hard to say no to the double action Super Redhawk.
As others have mentioned, the Super Redhawk could be fired single action style, but the Super Blackhawk, on the other hand, couldn't ever be fired double action.
That said, if it's only a hunting piece, you'll NEVER fire it double action, so spending the extra couple hundred bucks would be a waste.
I have both a Super Blackhawk and a couple Super Redhawks, and more often than not, if I'm hunting, it's the single action Super Blackhawk that gets the nod (of course, it's also the one with the red-dot mounted).
So obviously, I couldn't decide which one to get, so I ended up getting both. You won't be disappointed either way.