i would have to say depending on the situation i would have 2 carries,
1.a) 308 sniper rifle
2.a) automatic 12 ga shotgun with slugs sawed off.
(okay so i cheated and went with 4)
but honesty ill most likely be carrying these just because the time ill save reloading one round.
1.b) Beretta Storm
2.b) Beretta 92sf
No matter how powerful, or accurate you are with a gun, it always will need ammo. And there will always be more zombies than bullets.
My weapons are all melee. Sounds crazy maybe, but if you're just trying to survive, why call attention to yourself with any loud firearm. Kill only those in your way to stay alive. . . You're not going to be able to kill them all.
I already have my weaponry chosen, and they are safely stored in my closet. Dead serious. If I'm not near home- The bat is in my car's trunk. LoL
I own a variety of handguns, rifles, and a shotgun. But as I said, ammo will Always be an issue.
If I had to choose my top three weapons for combat, they would be,
My Austrian Mountain climbing IcePick (8 inch spike & hoe shovel head on one end, 3 inch spike on the other end)
WW1 Trench Spike for my off hand weapon (brass knuckles with a ten inch sharpened spike, meant to stab through helmets)
Folded Steel Katana (just cuz it looks cool, and its a long sharp blade)
Obviously other tools such as a good ka-bar survival knife or swiss army knife would be useful to have on you, but not as melee weapons.