EX? You must have meant XE, yes? First-gen X's came in XE and SE trim levels.

Agree that 83K is a lot for an '02. In only 20K miles you'll be facing the expense of changing the timing belt, are you prepared for that?

I'd also be concerned about the clutch when buying a used vehicle, especially with that mileage. Without knowing how that clutch has been driven, it may not be long before you're in the market for a new one.

Assuming by WOT you meant wide open throttle, I don't really shift under those conditions so I wouldn't know whether that's normal.

What color is it? I have a white '02 and the paint sucks (Nissan doesn't clear-coat white) so I'd buy another color if it's white.

As a previous poster said, look at more vehicles before you buy one.