Help, what's it worth? T43 2373D8U

[Think43]

I have a Thinkpad T43, model 2687-D8U, with the following specs:

P M 750 (1.86GHz)
512MB RAM
60GB 5400rpm HDD (Hitachi)
14.1 SXGA+(1400x1050) TFT LCD, no bad pixels or pressure spots
64MB ATI Radeon X300
CD-RW/DVD-R Multi-Burner Plus (UJ-822S)
Intel 802.11a/b/g wireless(MPCI) (Intel 2915)
Modem(CDC)
1Gb Ethernet(LOM)
UltraNav
Secure Chip
6 cell Li-Ion battery
WinXP Pro

Warranty is valid until 2009-03-20.

I've upgraded the unit with an additional 512MB memory and 9-cell and Ultrabay Slim batteries (both with very low cycles (under 10 each) and hold within 95% of their original design capacity. The 6-cell battery is weak. The unit is upgradable to Bluetooth (it does have the antenna in the display, as evidenced by the 3 visible wires under the hinge). The keyboard was recently (like, yesterday) replaced as the old keys had gotten slick. The new keyboard is an NMB manufacturered in China.

I'm wondering if y'all can give me a hint about the value of the machine. It's in good cosmetic condition, aside from the "Designed for Windows XP" sticker on which all of the paint has been mysteriously (heh) removed.

The machine would be shipped with the recovery partition intact and a full set of original IBM recovery CDs including the Lenovo supplemental disc and the Product Recovery disc (8 CDs total).

I am approaching a possible home purchase in the next 3 months and am looking to maximize my cash-on-hand.

[pianowizard]

$800 - $900.