Help me choose what camera to let go

So I can't justify owning seven cameras; I want to let go at least three of them, could you help me determine which ones to let go ?
I've got :
- Contax G2
- Nikon F3
- Leica M6 (non TTL)
- Canon Model VI-T M39
- Leica M3
- Canon Model 7
- A Hasselblad XPan