Windows 7: How much is my pc worth?

Hey all. So i have a pc that was kinda home build but some parts were from another pc :L
Anyway heres some spcecs and i will post some photos of it and is there any chance you could all give me a small estimate of how much you think you would pay for it. With all the estimates im going to put it on ebay. Thanks!
CPU: Intel Pentium 2.8 GHz LGA775
Ram: 3GB
Harddrive: 250GB 7200RPM
Graphics card: Nvidia GTX 550TI
Power Supply: 500W Alpine
OS: Windows 8 Activated (Down gradable to Windows 7)
MOBO: ECS MCP73T-AM MCP73VT-PM MotherBoard GF 7100 MB <--- Not sure if it makes sense
Disk Drive: Labelflash
Fans: All Fans=6 4 Red LED Fans - CPU Fan - Graphics card Fan

Graphics - £50-60 ish

CPU - £15-30 ish

PSU - £15-30 ish

RAM - £15-20ish

Windows 8 - £-10 Just Joking - £10-20 ish

Almost Same Mobo As Me - £25-40 ish

DVD Drive - £10-20 ish

Fans - £25-30 ish


I am no expert at 'Estimating prices' ask an expert before putting it on ebay

I'd say roughly $400, but don't quote me! I'm no expert! I think the best part of that build is probably the case, oddly enough

Oh yes and i forgot about the case -- £20-30