Selection of any firearm would depend on several factors:
1) What is your primary use for the firearm? (Will you primarily doing target shooting, hunting, personal defense, plinking, etc.)
2) Will the gun fit you properly? (Depending on your body size you may need a shorter stock if it's a rifle or shotgun, or possibly a smaller grip if it's a handgun, etc.)
3) Will you be able to find ammunition for the firearm? (Right now ammo is difficult to get in many calibers. Imagine trying to find something in a "rare" caliber. Without ammunition, your firearm is essentially a club.)
4) What kind of firearms training have you had? (I would not recommend that a beginning shooter start off with a very powerful firearm. If you haven't had the opportunity to shoot a particular firearm, I strongly recommend you do so prior to purchasing. I've seen many cases where people lose a great deal of money by going out and purchasing a particular firearm without knowing how it handles. They discover rather quickly that their firearm selection wasn't the "best" choice for them. To make matters worse, they learn that the $800 gun they purchased is now worth only $700 minus any consignment fees paid to the gun dealer handling the transaction, gunbroker.com, etc.)
Bottom line is that the only one who knows what's best for YOU would be YOU. I strongly recommend checking out a bunch of different firearms before making your final decision. Feel free to PM me if you need further information or guidance.
gf