I would recommend the 44 Magnum. I use a longer barrel than you want but that is a subjective thing. The benefit of the 44 is availability and power. You can buy it anywhere in your choic hof bullets and weights. It is recognized for what it does so well. Hits with authority! Single action vs double action your choice. Double action is just an other skill to challenge you with.
Buy the best gun you can afford. If you have to wait an other couple of months to get it, do so, you will be happy you did. My first Hunt gun .357 magnum was a disappointment. It just could not handle the 158 grain bullets I wanted to hunt with. It was a brand X, cheap, but not worth the price. It started spitting lead the cylinder would hang up, ect. I sent it out for service and got it back nice and clean, but still had the trouble.
My Ruger has swallowed many more rounds of greater power and still shoots like new, maybe better.
longwalker