n00b here!

Hi guys,

I have decided to put the twin turbo Mazda RX-7 project on abort, since it is starting to look like I will not be able to keep up with it financially.  I have been seriously considering an older (96-99.5?) Audi A4 as a practical replacement for a daily driver, and a bike to fulfill my craving for speed.  I registered here in hopes of learning a bit about these cars, and so I can hopefully avoid the bad ones when shopping for my future car. 

Please forgive my dumb newbie questions, and try not to let them piss you off too bad :) 

Is there anywhere you guys recommend checking out before shopping for an Audi that will warn me of things to look out for?  I have just a vague idea of what is good and what is bad in Audiland. 

Thanks for your warm welcome, Audi guys!