Price Check: m17x R2

I'm picking up a new beast, so trying to figure out how much I could expect to get for my old one (If I've posted in the wrong section, please accept my apologies)

1920x1200 RGB 1080P Screen
i7-720QM Processor
16 Gig RAM
Dual ATI 5870 in Xfire
Dual 500Gig Scorpio Black Hard Drives in Raid 0 @7200RPM
Blu-Ray Drive
Intel 6300 Wireless
Windows 7 Pro

Any help would be appreciated.