In motorcycling I've heard the same question about helmets. Granted the seat and helmet obviously have two totally different duties, but a similiar axiom applies. If you've got a $160.00 head, get the cheap helmet. If you've got a $700.00 head, buy the better one.
With seating, how comfortable in 3-4 months will the $160.00 seats be? What kind of life expectancy, how much more durable will it be than the Corbeaus or the Koenigs or the Recaro, etc?
Not trying to be Johnny-know-it-all, but that's how I view something like this
It's your butt