I would suggest this be placed in [URL="https://forums.macrumors.com/forums/54/]this[/URL] forum for price advice. A mod should move it for you. Youll simply get more traffic likely to answer your question in there.
It would also help if you posted what exactly it is. For instance, that picture is for several models. What is your CPU clock speed? How much storage does it have? Those are variables at the moment.
Youd be better off, IMO, by going to the
menu and clicking about this mac. Then clicking more info and getting screenshots of the different tabs. If youre still running under SL I dont think it works exactly the same but you get the jist. The About this Mac section will actually show your mac not just the 20 options from 2007 as your screenshot does.