My ride is a 2009 Mazda Speed3. So far, I've got-
Alpine SPX17 Pro mids (passive)
SSA DCON 12" S4 in a sealed 1.25cu-ft box
All fed by an Exile xi800.4
And some partially deadened front doors. It all sounds pretty darn good, and I'm going to keep the SPX tweeters, but I want to try other mids with them, since the SPX mids don't like to play nice too far under 90Hz.
That Exile amp is a beast, sending 125 to my doors and 400 to the sub. I'm seriously in love with it and thinking about marriage.