You'll quickly learn the answer to one of the stupidest questions an anti-gun nut can ask us:
"Why do you need so many guns? You don't need more than one!"
It's the same reason a good golfer has a bag of clubs to choose from. The right tool for the right job. And then there's the historical interest, the active competitions (your paintballing could come in really handy in the 'combat' oriented comps!), the technical interest, hunting or just plinking fun.
I try to buy guns of many different types. Some make their choices more particular, for specific interests.
Reading the forums, you'll quickly pick up on those that are better, and meet your needs, versus those of lesser quality or that don't meet your needs.
Again, welcome to the best gun forum site on the Information Highway!
I would urge you to also join at least one good Pro-Gun Rights organization - even if you don't get 'active', they'll keep you informed of the egregious activities of the Antis.
NRA, GOA (Gun Owners of America), JPFO (Jews For the Preservation of Firearms Ownership - and you don't have to be Jewish to join!), and any good local groups where you live.