Sell pre-built gaming PC (What do they go for?)

That is not a completed system, you are missing a few parts,

couple of questions so we can help you:
whats your budget?
what resolution do you play at?
what games do you plan on playing?
do you plan on overclocking?
do you need an OS license?
 


Motherboard would be MSI B75a-G43 Gaming

He's not overclocking & Windows i have and it is optional

We have already decided on parts,i just want to know what would you charge someone to build this for them and if i was to list it on ebay all built what could i sell it for