I just bought my Momz an off-lease Dell Latitude D630 on Ebay for $360.00 shipped that is like brand new:
Intel C2D T7250 2.0GHz
2GB RAM (DDR2 - upgradeable to 4GB)
60GB HDD (I upgraded it to 160GB HDD for $43.50 shipped from Newegg)
CDRW/DVD Combo
WLAN a/b/g
Integrated Bluetooth
Integrated TPM
NVIDIA Quadro NVS 135M 128MB (basically GeForce 8400GS)
14.1" widescreen (1280x800)
Weighs something like 5.6 pounds
Came with Windows XP Professional but the BIOS has the necessary support for OEM activation of Windows Vista. Dell's warranty checker shows that it still has some 400+ days left on the warranty. I'm not 100% certain it is transferable to me, though. If not, I could purchase a SquareTrade warranty for $50, but I'm not going to.