What is insidious in this hobby is that, no matter how many guns I have in the collection, there is always a long list of others that I want.
I think it is driven by why you buy guns. If hunting deer and pheasants are the primary purposes, you could be pretty well served by 1 or 2 rifles and 1 or 2 shotguns. Any new wants are likely driven by big changes in technology. If you are an African big game hunter, you could get specialized gun for different classes of beast. If history and/or a fascination with the mechanics/artistry/variations of the piece are you interests, you can easily create a never ending list.
Here's my current wish list. Case in point == I hadn't updated this for several months and had to delete 3 that I've recently bought. But I added about 6 more that have recently caught my fancy.
High Priority
• Marlin 1895SBL, .45-70
• Ruger Mk III Target, 22 LR (so my son can “officially” take my Mk II)
• Springfield Armory XD9 Sub-Compact, 9x19mm
• Ruger Blackhawk, .357 Mag
• CZ 550 American, 6.5x55mm
• Ruger Redhawk, .45 Colt
• Winchester 1895, 30-06 (so I can convert it to .35 Whelen)
• Israeli HB FAL, 7.62x51mm
• Winchester and a IHC M1 Garand
• 1873 Winchester, 20” octagonal bbl, .45 Colt
• Springfield SOCOM Scout M1A, 7.62x51mm
• Webley MkIV, .45
• S&W 625, .45 ACP
Lower Priority
• Martini Henry
• 1942 Johnson, .30-06
• 1860 Army, .44 BP
• 1858 Remington, .44 BP
• Ruger New Vaquero or USFA, 5.5”, .45 Colt
• S&W M66-5 .357 Magnum
• CZ 550 American .375 H&H
• Remington Rolling Block, 7x57mm (?)
• Italian Carcano, 6.5mm
• Sig 556 Classic, 5.56x45mm (jury is out on this one)
• Bushmaster ACR, 5.56x45mm or 6.8 SPC (jury is out on this one)