I'm with you, man. I'm thinking about letting go of 3 of my games. Just to downsize a bit. That being said, I know if I do I'll never get them back as the purchase prices for these games is just getting to be too much.
Step back and think things through. Ask yourself if you would really miss them if they were gone. If yes, dont sell. If no, do sell. If you dont know, you prolly would miss them....