While I agree with those who say you don't need to buy everything at once, if you feel like it, why not? It would be the most fun day ever! Here's kind of the order I went in and what they may cost you, more or less. If you shop around or buy used you could find them for even less. (I generally rounded up a bit) and the parentheses indicate other options:
Ruger 10/22 Stainless/Synthetic Stock: $250 (Marlin M60, cheaper, less mods available, but still nice)
Beretta 92FS: $550 (Glock, XD, SigPro, CZ....any 9mm semi auto will do)
Mossberg 500: $330 (Remington 870)
Browning Buck Mark Stainless Camper: $350 (Ruger 22/44 or MKIII)
Remington 700 ADL .308 w/ Scope: $400 (Browning A-Bolt)
Ruger LCP: $300 (Kel Tec P3AT or Taurus TCP)
Mosin Nagant 91/30: $150 (SKS, although that is more like $300)
PSA M4 Carbine: $600 (Stag or Spikes for around $800 or Colt for around $1000)
Total Firearms Cost: $2930
I am pleased with where my arsenal is at....for now. I definitely don't splurge on any purchases. I know you said quality over quantity, but to what extreme? You could spend all 3 grand on a really nice 1911 and have the best of the best, but then you only have one thing. I'd say a good balance can be struck. The only thing I went the cheap route on is really the 700, with its base model and cheap scope, but as of yet, I haven't been able to outshoot the rifle yet. Plus, if you decide you aren't into something, you are out less cash. You can always spend more on anything, and get something that is marginally better for a significantly higher price tag.
With that you get 8 different firearms, .22LR, .380, 9mm, .223, .308, 7.62x54R, and 12-gauge. You will also have something for any occasion, whether it is hunting from squirrels to bears, clay pigeons, concealed carry, anything. If you decide you LOVE long-range shooting, then down the road invest in a nicer rifle. If you love pistols more, look to get a couple more in the future. But really as you already know, YMMV, JMHO, different strokes for different folks, etc. HAVE FUN!