It's like pokemon, got to catch them all.
You need at least 2 shotguns, a 12 and a 20. A .410 would be good too. One of them has to be pump, because everyone loves the Cha-chunk sound. You need at least 1 big game hunting rifle. Then you will decide that one is too nice to drag through the bush so you need a bush gun too. Then you need a long range rifle, because you totally plan on hunting sheep one day. Half a dozen 22's is a good starting point, you can never have enough 22's. One semi-auto pistol from each manufacturer will get you started. One Glock in every caliber. You need at least 3 revolvers, one of them must be a .357 magnum so you can say "Go ahead, make my day" a bunch of times.
Then it's time to start your AR-15 build...