I always thought rims rode better with rubber on them.
I prefer Michelin for a smoother ride.
Are you talking the 20" rims ? I don't really like the ride on the shorter tires myself. The 17" are fine with me. With a nice 70 or 75 sidewall height as opposed to the 45,50,55's.
Van Chevrolet out of Carrollton, Tx has a few spots on e-Bay selling several different styles of the 20" GM rims + 275x50x20 Goodyear Eagles for $2150.+ free shipping. You won't beat that price I don't believe. Includes lugnuts and covers except the center caps.