How much is my X61s worth?

[iamdmc]

Specs:

CPU: Intel Core2Duo L7300 (1.4GHz, 4MB L2 cache)
Mobo: X61s Mobo
Screen: Ultralight X61s XGA display
HDD: 120GB Seagata SATA3gb/s 7200.2 HDD
RAM: 4GB PC2-5300 667MHz (2x 2GB OCZ ValueRam)
Graphics: Intel GMA965/X3100
Wireless: Atheros ABG card, Bluetooth 2.0+EDR
Batteries: 4-Cell (still holds 95% of design capacity), 8-cell (holds 100% of design capacity)
Software (Legal, unopened): Microsoft Office Professional 2007
Accessories: Lenovo 65W Charger
Warranty: Ending September 2008 (Can upgrade to end Sep2010 for $120)

Original owner, kept in a neoprene case when not in use, used by a responsible adult in a non-smoking environment.

So how much is she worth ?