How much more do 14' SXGAs cost over 14' XGAs?

[iminlovewith]

Hi,
Im thinking about picking up a used T40.. What Im wondering is, how much more should I expect to pay for screens with SXGA over regular XGA?

In particular, I'm thinking about pickingup a 2373-58U with the following specs: IBM ThinkPad T40 with the Centrino 1.3 chip. 32MB Video RAM, 512 RAM, 14" SXGA+ screen (no dead pixels that I can notice), DVD drive included with a 30gig hard drive. Wifi wireless networking (b) is installed.

Does that sound like a good deal for around ~$900 USD?