Damn me and my veritably zen-like lack of attachment to mere objects!
1500pt 40K force with options: 0
A 2000pt+ WFB army with options: 1
A 1500pt FOW army with options: 0
A Warmahordes whatever: 1
A full Bloodbowl team: 2
A Mordheim warband: 0
A Necromunda gang: 2
A Malifaux crew: 1
Hundreds of models over 15 years old, but most of them are Very Small (see below).
Cluttering up my closet: Not too much, it all pretty much fits on one shelf in my bookcase: the better part of my nascent 6mm napoleonics force, a couple sets worth of skull pass gobbos for WFB, some Epic odds and ends I still haven't painted, and I think a BFG light cruiser or two.
Forgeworld: Quite a lot of Very Small (see below, again) FW models - 2 warhounds, 3 basilisks, 4 eldar phoenix fliers and 4 ork fighter-bommas, a dozen Wave Serpents and 9 Imperial superheavies of various flavors. Would be more impressive if they weren't Very Small, I admit.
Things that don't count 'cause Pikey is a biased, small-minded fool:
3000pt+ Epic army with options: 5
2000pt+ AT-43 army with options: 4
2nd edition Confrontation armies: 2 (Why th' heck do I still have these? Anybody want to buy some Celts or armored S&M wolfmen?)