You've got a good list there. Each firearm being unique from the others (in terms of purpose). Add a .357mag revolver and a pneumatic air rifle and you're all set IMHO.

If you don't currently hunt, and don't really plan to except during some emergency disaster situation, for that .308 you could substitute something simpler and a whole lot cheaper. Like a Mosin Nagant in 7.62x54R. Just as powerful as a .308, but not as sexy (unless you go ga-ga over military surplus rifles - as I do). If you want a visual primer on Mosin Nagants, watch "Enemy At The Gates" or "Defiance". Good movies. Those Mosins can run less than $100 and ammo is around $75 for 440 rounds (and it's plentiful). Very accurate, powerful, bolt action. Stick the bayonet on there and it's probably as long as you are tall. A hoot to shoot! Lots of chioces in the "large game hunting" class: .30-06, .270, .308, 7.62x54R, 8x57, and on and on. A surplus German Mauser or Russian Mosin will serve the purpose just as well as an expensive rifle. And face it, you're just NOT going to be buying .308 ammo at 440 rounds for $75.

But I digress... By the time you get to this point, you will already own five .22's, multiple mid-range calibers, a dozen handguns, and you'll be buying these guns just because you WANT them. You won't be trying to JUSTIFY why you need them anymore. It gets real expensive at this point. Ask me how I know!