Bridgport stepper replacement?

The Z axis on my Bridgeport series I is about to poop out on me. It
keeps stalling at lower and lower speeds. I'm running a Gecko G201
driver and would like to know what the best replacement for for this
motor might be. Theres one on Ebay that looks to me like it might
work, but if somebody who knows more than I do would be kind enought
to tell me if it would, I would be most grateful. The link is:

http://cgi.ebay.com/NEMA34-680oz-in-Bipolar-Stepper-
Motor_W0QQitemZ260011621504QQihZ016QQcategoryZ78196QQrdZ1QQcmdZViewItem

It ends around 10PM central time, and there are 12 of them if anybody
else is interested also.

Thanks
Nathan Clymer