I am partial to the single actions because I know it's difficult to tear a S/A up. Since you have your mind set on a longer barrel I would go with the S/A. Really, I would buy the best pistol you can afford. You won't live long enough to regret it.
"I do not aim with my hand; I aim with my eye. He who aims with his hand has forgotten the face of his father.
I do not shoot with my hand; I shoot with my mind. He who shoots with his hand has forgotten the face of his father.
I do not kill with my gun; I kill with my heart. He who kills with his gun has forgotten the face of his father."
For a hunting handgun get the red hawk or super red hawk with a 7.5" barrelas it is set up for a scope down the road. Plus the extra weight is nice for the hotter rounds that it can handle. You are buying a handgun to pass along to your children so make it count with a model that easier to shoot for anyone. A hog blasting buy at 5 feet or a deer that just appears under your stand as they tend to do may not allow for the trigger to be cocked. I started revolver hunted in 1976 and never wanted for a sa trigger.