PC Resale Value?

Looking to offload my PC, Don't use it anymore, not sure whats it worth really, I was hoping for atleast £200.

Casecom 6788 All Black Case
Intel® Core™ i3-2100 Processor (3M Cache, 3.10 GHz)
Arctic Cooling Freezer 7 Pro CPU Cooler
4GB DDR3 RAM (Kingston, 1333Mhz)
Asus P8Z68-V LX Motherboard
Arctic Power 450W PSU
1GB Nvidia GTX 550Ti GFX Card
Liteon DVD/CD Reader writer Combi
Kingston 60GB SSDNow V300 SSD SATA Rev. 3.0 / 2.5
Western Digital Green 500GB SATA Drive.
Also has a legit copy of Windows 7 Home Basic, Not certificate of authenticity however :(