Adam 
2003 BMW 3 Series Sedan 330i Rwd 4dr Sedan (3.0L 6cyl 5M)
Fun and practical
 I moved from a Miata to this after the 2nd kid forced the need for a back seat.  It's been a great car so far. Incredibly comfortable for interstate driving and commuting, but still fun enough to toss around without requiring insanely high speeds to enjoy it.  Maintenance costs haven't been too bad when I've used shops other than the dealer.