I have on my list four firearms that I feel I really need. All 4 are back-up versions of another firearm I already own. Which of the four do you think would be the most important to buy with the money I've got in my pocket right now! All four of these firearms will be mine within 18 months, but I need to know what to do with my money NOW. I have way too much ammo to be limited by only one firearm in each caliber/gauge. HELP!!!! Shotgun: Mossberg 590a1 ($600 with some extras to go with it). I already own a 590a1 so this would be a back-up for a different gun safe. 9mm Carry Pistol: A single-stack subcompact pistol (Ruger LC9, Kahr CW9, etc. $600 after holsters and such). I own a XDM 4.5" 9mm so this would be a second 9mm, but my only 9mm for carry purposes. I already have three other great carry handguns in my rotation. .45acp Full-size Pistol: Springfield Armory XD45 Tactical 5" ($650 after some extras). I regularly carry a Kahr PM45, but that is my only .45 and really want a double-stack full-size pistol. I'm over the 1911 platform unless I could find a low-priced Para P-14. Bare-bones AR-15: 5.56mm 16" Lightweight (Palmetto State or Del-Ton parts that I'd build/assemble myself $750). I already have a very effective AR-15 20" barrel with all of the features I need. But with a few thousand rounds on hand, I think I should have a second AR.