I was going to trade my B5 Variant in today, but I had a change of heart a bit. I am wondering how there can be such drastic differences between the three main used car price sources Kelley Blue Book, NADA Guide, and Edmunds? The dealer is offering me what ends up being the NADA value, but he mentioned the KBB value when talking to me. It seems that KBB is always referenced by the dealers, and it always seems to be the lowest. How can the others be accurate if everyone uses KBB? Reason I am asking is that I nearly considered dumping the A6 instead.