Hey Jeremy I asked about plasma cutters a while back and got some very good responses. Here's my thread on it. Plasma cutters. What works best for you?
Thermal Dynamics seems to be one of the leading manufactures in plasma cutters. As far as the price you found this one for, have you looked on ebay or craiglist to see what used one are going for? Without looking myself, have you checked on the new price for this paticular one?
Be sure you get the drag tip if it doesn't come equipped, makes them much easier to use. I've been borrowing one till I can get one myself and they are one of the greatest tools you can have.