I drove an '08 w/automatic and dealer installed 16" with Bridgestone 45 profile tires, then an '08 5-speed Sport with 15" 55 profile tires over the same roads and the 15" 55 profile tires were much less harsh on poor road sections and quieter on the smooth sections. I bought the 5-speed sport as it will be used for rural and long distance trips and the 15" 55 profile tires are a much better package for this type of use, IMO.
FWIW,
-Rod
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2008 5-speed Sport purchased 3/8/08
Rod's Autos Website