What is the value of:

Upgrading to ps4

Xbox 360 slim, 250 gb
GTA 4, 5
Fifa 10,11,12,13,14, 15
Modern warfare 1,2,3
Assasins creed (the one before latest)

Going to sell this as a bundle on ebay.
What price should i start the bidding at?
Is 100pounds fair or is that too low/high?
Is there a better place to sell than ebay

Any advice would be welcomed