I actually bought insurance specifically for my collection. I went to Allstate. I have $25,000 of protection for ~$15K (Purchase Value) of collection. I have a $2k limit per item, up to the $25k. The only real caveat is proof of ownership. I even asked if an "online photo journal" was proof enough. The answer was yes. If you have DQM Frogskins, Signed-by-Jim The Oakley Goggles, or any other one-of-a-kinds, make sure to get an Agreed Value Clause. You'll pay more for it per item, but you can have that Mega Tower insured for $30k.
Anyway, I pay like $150 a year for $25k in insurance, and that covers everything in the house. Specific item insurance may be harder to get, but homeowners/renters insurance is cheap and easy. Also, make sure your insurance, to include car insurance, covers theft, both from your home and your vehicle (car insurance won't cover theft from domicile, but homeowners may cover theft from vehicle). The last thing you want is your car broken into, the Pit Boss in your glove box getting ripped off, your stereo loss being covered, but the glasses not.
Thus endeth my rant.