Well...
I have 2 SS50's that I brought at a yard sale for like 5$ each.
An XP 220 that I got off ebay which was part of a big 11 soaker purchase.
An awesome XP 270 that can shoot up to 40 feet. Also part of the 11 soaker ebay purchase.
A CPS 2700 which is my most powerful blaster. Also part of the ebay purchase.
A Max-D 2000, 2008 recoloring. It leaks from the nozzle though.
A MD 3000, (2003?) recoloring. Another part of the ebay purchase.
2 MD 4000's 2003 recolorings I believe. Two other parts of the ebay deal.
A MD 6000 2008 recoloring which is one of my favorite blasters. (Aside from the awful grip.)
A MD Secret Strike. Soaker tag remake. Another blaster off the ebay deal.
2 Vaporizers, a Soaker Tag version which was part of the ebay deal, and an 06 recoloring.
A broken Hydoblade. It came like that off ebay. I don't know if it's worth it to fix it though.
A Helix, that was also off ebay.
An AquaShock Sneak Attack.
An AS Secret Strike (Also called "Cover Control" for some reason.)
An AS Arctic Blast. Used to be my favorite blaster, until it broke. I fixed it, but it's still faulty.
A 100oz Aquapak that leaks.
A Quick Blast.
An Equalizer.
A Vanquisher.
I also have a couple of squirt pistols, a pack of water balloons, and some soakerballs.
And who could forget my trusty 2L Homemade?
There's only 10 blasters listed here from the 11 soaker deal off ebay. The reason for that is, cause there was originally an XP 310 included in the bunch, but when I got it in the mail, the reservoir had cracked off. So I just chucked it. (I probably could have done something with it, but I didn't think of it at the time.)
Some blasters I used to have:
A Storm 760 which was my first air pressure blaster.
A Storm T-Shock 8000.
A Monster X 2002 edition.
A CPS 4100.
A CPS 2100.
An original Max-D 6000.
An X-Stream blastmaster of some type.
A Max-Infusion Flash Flood.
An Oozinator.
And a TON of squirt pistols when I was little. Including a Mini XP 70 that was my first Super Soaker.
I've been into water blasters since I was about 7 years old. (I could lift my MX when I was 7, which I am proud of.)
EDIT: I updated my list with the WW Equalizer and Vanquisher that I got my brother for his birthday.