Just to make your thread feel better, I'll post.
I personally have the 6.5" Infinity 652i's in the rear deck, which sound awesome... As for the fronts, I am saving up for a pair of Polk 4x6 plates which have the same tone as the Infin's.
What you might want will also depend on what you intend for it to put out... Do you want deep, solid bass?? Strongest mid-tones??? What kinds of music to you intend to play on them? Just trying to give you some ideas.