I think that is a little high for a 90 Burb. I know of two loaded, almost perfect 2500, 4X4, 5.7, auto, Burb's that were recently sold here. Both had front Bucket seats, with 2d and 3d seats, roof rack, front and rear heat/AC, mileage was close to 65,000 on both. The red '98, was an LS (cloth) with aftermarket lights, aluminum polished spoke wheels, radio/cassette/cd, and on-board GPS for $8500. The blue '97 was an LT (leather), radio/cassette/CD, stock wheels, stock lights for $8150. The paint and chrome was great on both, and although I didn't get under them and check, both looked to have straight bodies, with no sign of being wrecked. The '98 was local NC vehicle and the '97 was a FL vehicle.
I was interested because I have a 98 Burb and both of these were as good looking as mine. I can't say for sure what their mechanical condition was but with the mileage and the way they looked they seem to have been taken care. A white loaded '98 Burb with 32,000 miles on it, sold for 15,500.
But there is no way in Hell I would take less the $15000 for mine.