I have 42k on my '06 Ltd and b/c I haven't kept up with rotation as well as I should have, my front stock tires are at the wear indicators now. They've never struck me as good performers in water (even when I first got the car).
So... I did a search and read several threads. I've I was able to reach any type of 'consensus', it was that with the stock rims, 235/50-17 seem to be a good size if you want to go a little wider and bit lower profile. Using the calculator below, I'm comfortable that the diameter effect (speedo accuracy) change is nearly negligible with this change from 215/55/17 stock size. I have two questions (and the are inter-related):
1) With the same tire in these two different sizes, how much affect could I expect to feel in ride quality?
2) What are some good tires in this size if my concern factors are water performance, quietness, and tread wear life? I'm not necessarily looking to buy the cheapest, but also not looking to break the bank, so I guess I'm looking for that good balanced tire in these areas.
http://www.discounttire.com/dtcs/infoTireMath.dos