Congratulations on the impending move. You will learn what true (almost) liberty feels like. Don't let it go to your head tho.
First, what ellis said.
Caliber and model are the least important topics, and easily resolved. Got to a store, handle a bunch, find the ones that fit your hands. Then off to a range and rent those you like - and some you don't - and shoot them to find which ones fits you the best.
Caliber depends on what you're shooting. If you expect to encounter bears, I would go with a S&W .500 caliber something. Bad guys coming through the front door? Something a tad lighter would be acceptable.
Get training, and since you'll be in a new state, check with a lawyer with experience in firearms cases.
Then worry about brand/model and caliber.