20s are probably going to be more expensive in the long run and you will sacrifice some ride quality. I put 18s on for the winter and it's like night and day. 20s have much harsher impacts over bumps, although some of that is due to the Dunlop run-flats. Conti DWSs are supposed to be much better and i plan on putting some on when the Duns run down. I got the 20s b/c I'm in Germany and drive speeds well in excess of 100mph and the car feels much more stable on the 20s at high speed. I won't do more than about 100 on the 18s, but that's probably not an issue for you or much of anyone on this board. My fuel economy also improved about 1 mpg when I put on the 18s. With that being said, mostly the 20s are a cosmetic choice. If I had it to do over again I would go with 19" all-seasons.
Of course this is all IMHO. Take it for what it's worth.
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