When you can buy something brand new from Apple for the same price why would you buy a used machine when it has inferior specs and may or may not not have any Applecare left? A 2.1GHz machine is from Feb 2008 or after, but since there is only 4GB of RAM (worth about $40), I don't see how it can be priced at $1300 when a much better 2GHz PCB machine is now sold for $999 or the Alum model for $1299. Either that or get a refurb Alum 2GHz for $1099, pay for new DDR3 RAM at $55, Applecare at $125 how can you justify $1300 for a used machine?
I'm not saying there is something wrong with the PCB MB I'm just saying they don't make the 2.1GHz MB and it uses an old graphics system so they definitely don't make any of the 2.1s anymore. The new White PCB MB is only $999 for a better system. You can't justify the $1300 for the 2.1GHz model.