I only have a few..
Winchester model 1894 (made in 1994) in .30-30 -- This is a fun gun to shoot and is a classic. It was my first gun and I think that someday I would love to sit on my back porch and shoot prairie dogs or something with it while smoking a cigar. I won't ever sell this one.
Mossberg 500A Persuader (full synthetic stock version) 12 gauge, 20" barrel -- I just got this one a few months ago and I plan to keep it as a home defense and general purpose shotgun. I've shot trap with it, I've shot paper targets with it, and I'll shoot anything that comes in the front door without my permission with it.
AR-15 in 6.8x43mm with the DMR-C chamber (the tightest one available) 16" barrel -- This was my first AR and will stay with me until I die. It can easily hit a quarter at 100yds. If I was going to hunt any small or medium game, this is the gun I would use. It can carry 1000 ft-lbs of energy out to 350 yds. I can't think of many situations where I would need to shoot much further than that.
AR-15 in 5.56mm, 16" barrel -- This is quickly becoming my "go-to" gun. It's the cheapest to shoot and it is fairly accurate. I have a RDS on here and I like to do "run and gun" drills and practice (and improve!) most of my shooting skills with this one. In a SHTF scenario, I would grab this AR and the Mossberg along with their respective ammo cans full of ammo and head for the hills in my truck.
I hope to get a Glock 19 and start carrying, but there are other things that need to be taken care of first. (finish school, etc)