Inspect it closely, go over it with a fine tooth comb. You're bound to find things that need replaced. Keep those things mind when formulating your offer and use that to haggle on price.

The market for 240s is pretty strong. $2000 doesn't sound unreasonable, but only if it's an honest car that hasn't been neglected.

You'll likely get more response on the RWD forum. With that I'll mention that you can probably find a decent 850 for the same money. Newer, more comfort and power, same economy. Parts are more expensive, but I dare say that overall cost is the same since you'll need to do maintenance less often.

-Will