That's me. I've been on the AW and now QW UrS forums for about 15 years. I'll still be active over there even without a UrS anymore. It's a great community and I know way too much about those cars not to share it with other owners.
Did you import the Avant yourself or buy it after it was already brought over? I like C5 Avants, but I prefer the sedan for myself. My wife had a C5 S6 Avant from 2007-2014. That was a great car and still felt solid at 200k miles when we sold it to buy a C6 Avant for her. First an '08 with the 3.2L. That was rear ended and totaled last year and I replaced it with a '11 with the 3.0T. The 3.0T is such a nice engine. It's faster than the C5 S6 V8.