How much is a Powermac G5 worth in 2014?

I am looking to sell my PowerMac G5, and need to know what to price it at? I know they are pretty outdated, but this one is upgraded! I am including a Samsung Sync Master display, Apple Aluminum keyboard, and mouse. OS 10.5.8 is installed. The specs are dual 2.0 GHZ PPC G5 processors running @ 2.0 GHZ, 6GIG's of ram, dual hard drives (250+150), Nvidia 6600LE. PS its the late 2005 model. Any help?