Summertime is finally upon us & I am thinking of Upgrading my Speakers in the car.  I currently have Infinity Reference 6 1/2 Components in front & matching Infinity Reference 6x9's in back.  The Infinity's have been wonderful but I am wondering what everyone else thinks.  I think I am gonna go with CDT Audio Components in the front but I dont know what I should put in the back.  I was thinking of Staying with Infinity but upgrade to The Kappa Series.  Also was thinking about Boston Acoustics but what else is out there to work with.  Any opinions front or back?

and they sound oh so good.