Re: Good all around caliber?
The worst rifle I ever owned was my first one. It really makes it hard to learn if you aren't getting the appropriate feedback from your targets. Lot's of discussion about what's best, but the better it shoots, the more fun you'll have, the longer you stay with it. Same with scopes.
Like every on else has said more details would be helpful, but this is your first rifle, and you're new to hunting. A good .308 is hard to beat in the beginning. Ammunition is available over the counter in variety, quality, and quantity at comparably good prices. Shoot the barrel out of one of these and you'll have a good idea of what you want to do by then.