I have a great perspective when it comes to comparing the A4 vs A6, because I just got my B7 A4 in February, and my dad got a B7 A6 in the middle of last year. His car was the inspiration behind my choice of an A4, which was more in my price range. I'm actually shocked to hear from that other person that an A6 was near the same price as what I paid for my A4, tho.....maybe I got ripped off!
I am 6'2", and when I have the seat set up how I want it, there is VERY little room behind me; my 14 year old sister would even be cramped. However, I also find I have tons of room to scoot up, and I don't mind doing that at all when I have passengers in the back seats.
That being said, the A6 never felt terribly spacious either, even with my parents who are on the shorter side sitting up front when we go out as a family. My knees definitely hit the back of the seat in front of me if I point them forward, so I guess u could say the A6 causes me to do LESS of a spread-eagle to fit, but in the end there's still more room.
I'd say if you can get an A6 for near or the same price with the same miles and options as an A4, go for it. However, the A4 has plenty of versatility with respect to making room for rear-seat passengers, and it also is just a great car overall - not to mention the 2.0T engine and overall A4 platform is more mod-friendly.
Either way, the friends telling you that you're crazy are just jealous, and trying to keep you from getting a much more badass car overall than they have!
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Best of luck with the choice, friend, and welcome to AZ!
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