I won't try to address the wagon vs. sedan argument - - you'll know how much space you'll need.
As the proud new owner of an A4 Special Edition, however, I think I can attest to the fact that it's a great deal. Lots of good options in a competitively priced package, both vis-a-vis other cars out there as well as what you'd pay Audi to build a car like that "a la carte". Also, a *LOT* of fun to drive!
Good luck. . . .