Sooner or later, you'll get the desire for an AR-15. Semi-auto, almost no recoil, very ergonomic, inexpensive ammo available everywhere.
Probably the most "fun" you can get.
If you hunt deer, it's legal in some states, but if it's not legal in yours, you can get upper assemblies in half a dozen larger calibers.
You will probably get several guns over the years, but you can't go wrong with the AR-15 first.