Apple iMac 20 inch computer 500pounds ONO ?

Its a Core 2 Duo 2.4Ghz, 4 Gb Ram. 500Gb Hard Drive with latest copy of photoshop installed (worth 400 alone). Immaculate condition, reason for sale is purchase of MacBook and no longer require both. Comes with apple keyboard and Logitech mouse (if req). Happy to answer any questions. Brilliant computer.