A4 Vs. A6
1) No leg room in the back seats. Every now and then you may have more than 2 people in the car. (Wouldn't suggest making a habit of it though)
2) No mods to be done to the 4.2. You've got plenty of power and you'll need it for your size. The 1.8 will have to have mods to be exciting to drive and the mods may void your warranty or stress the engine.
The money you'd spend on mods can be saved for future maintence of the 4.2. You can't get around spending cash on any Audi.
3) The 4.2 Just looks better with the wheels, wheel wells, it's just nicer. Not like a regular 4.2. Very agressive looking. And they're rare (at least around here).
Those are my reasons but do what you feel comfortable with.
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