A fair price for selling these components.

Selling:
AMD Phenom II x4 840 3.2GHZ (Never Overclocked)
12GB DDR3 Ram
Biostar Motherboard AM3 Socket, supports upto AMD 1100T 6 core cpu
EVGA Nvidia GTX 550 ti superclocked edition 1GB GDDR5 -Already factory overclocked
22" Samsung LED display 1920x1080

Trying to get a fair price for all of this. I had it in a build but and decided to sell it to help build my new machine. Someone want to buy the parts and not the full machine. They say they already have a case, and stuff they they picked out. Any ideas of a fair asking price. The LED monitor is probably only 3 months old at most. Thanks for all the help!

Oh, even if some are different prices, it'll at least get me an idea and ballpark to work with. Thanks!