Sweet guns.
I've dealt with the same issue. My solution is that I never have more than a few guns at once. I sell mine after a while if they prove anything less than awesome. If it's not perfectly what I want, I sell it and try something else. So far, the only gun I'm 100% keeping is my KSC Glock 19. I've had a TM P90, AK, MP7. A JG G36c. A Galaxy MP5k PDW (which I used a long time). I just end up selling most of my guns. I've had over 40 different guns (many of which I never even used in a game), but I currently have like 5.