Did you check kelley blue book? Quattro?
Check around on Autotrader.com, see what other ones are going for. I searched around on their for a few months before I picked mine up...Ibis white, premium plus, 25k miles and I got it out the door for $26k. I had to drive almost 3 hours to get it, but every dealership around me was asking almost $30k for A4's that weren't even premium plus and had over 30k miles on them.