I agreed with jdhog...there is no mistake going with the matrix as a family car. I currently drive a matrix and fitting the rear-facing car seat with two passenger in the back with lots of leg room and comfort and enough cargo space for the stroller is wonderful...you cannot go wrong with the matrix.
When we were in the market for shopping for a car in '05, we came close with a Rav4. The space in the back is smaller and not as comfortable versus the matrix. Also the ride is very shaky in the Rav4 compare to the Matrix smoother ride. I brought along my wife, my brother-in-law and mother-in-law to be the back passenger while I test drove the Rav4 and the matrix. The winner of choice is the matrix