Hey CaseyK-
The 225's are a bit wider, but I don't really notice that they "stick out" any farther...certainly no indication they make the car any dirtier, but I just washed it, and haven't been through any puddles recently. I'll keep an eye on that.
I do like the tread pattern on the 225 KDW...much more aggressive-looking than the pattern on the stock 215's.
I'd thought about 17's, but didn't want to spend for wheels and tires at the moment. If I did go 17", I think I'd probably pick up a set of the SVT Focus wheels...I have yet to see a set of wheels on an SVT Contour that I like better than the OE.
On the all-season ultra-performance idea, the tire shop guy said he would not suggest the Pirelli P7000 SuperSport for all-season use, but as a summer tire. He says the performance is very close to the regular P7000, but they're a bit less expensive than the summer-only version, and about $30 cheaper than the KDW.