Three words: condition, condition, and condition.
The price means nothing without knowing the maintenance history and usage on a dirt bike. Very few people go thru and do all the required maintenance BEFORE selling a bike, unless they are a reputable person and friend. Or, the bike has so few hours it is not in need of the major maintenance and repairs that come with a 5 season old machine.
It may be a good bike, but it could also need the rear linkage rebuilt, swingarm bushings, wheel bearings, suspension service/repair, top end, bottom end, tranny work, head tube bearings, tires, cables... you get the picture.
It does not sound like from your post that you are the type that gets a kick out of buying a clapped out POS for a bargain and bringing it back to life. I have a dimented friend that is of this personality type, but he can split cases one evening, order parts the next day, get the parts in, and reassemble and install the motor in another evening.
A '97 is the right age to be in need of alot of work. If you cannot verify the hours, then skip it. You can keep your eyes peeled and pick up a for sure low hour '99 or '00 EXC or jap MXer in that high 2K/ low 3K price range. They are out there.
JMO,