Rixor

I have a 98 A4 2.8L (Quattro) with the stock wheels ( like the ones on this A4: img76.imageshack.us /img76/9127/22300jy2.jpg - just remove the space after .us had to bypass url blocking ) and I want to get some new wheels. I have seen 19"s on the same model of car and they looked amazing, but I have a few questions.

How rough of ride would the 19"s give me? Are 18"s more recommended? Would 19's be more prone to getting bent when hitting a pothole since the tire sidewall would be smaller?

What is the width and offset of those stock wheels? I couldn't find that info anywhere.

The current tires are 205/55/R16. For a set of 19" wheels, would a 225/35/R19 be a suitable tire? Is an 8 inch wide wheel suitable?

Thanks in advance!

Rixor

Also, the stock radio in my car (its the crappy non-Bose version) has died or something. If i turn it on, it just says "Safe" which I guess stands for safe mode. Is there anyway to fix that? If not, anyone know where one could by the keys required to pull the stock deck out? I miss my tunes!