Issue #1 - Tire/wheel upgrade for A4 Avant

[ricematthews]

I am considering the possibility of upsizing the rubber and possibly the
wheels on the A4 Avant.  I currently have the 7 spoke sport wheels with
205/55/16 tires.  The math tells me that acceptable alternatives (based on
wheel diameter) would be 225/50/16 and 225/45/17.  From what I have heard, I
think the 225's should fit.  I'm sure many out there have used one or the
other of these sizes on their A4.  Is there any rubbing with the 225's?
Does anybody have other pros or cons about the 16 vs. 17 inch.  I tend to
deal with more bumpy roads than many (it's a Pennsylvania thing).  Will the
17's bend really easily (I realize that this depends partly on wheel brand
too)?  Does ride comfort suffer a lot with the 17 inchers?  Any other
comments?

Thanks!
-Mark Rice