Sorry...forgot to mention that. Running everything with an Onkyo 876.
I almost did the same thing as you and went 5B all around, but I realized that with my primary use being HDTV and Home Theater, I could stand to have smaller speakers in the back.
I live in a pretty small space, currently, so I decided not to overdo it with 5T's, though it would've been pretty sweet. Honestly, had there been 4T's in stock, I would have strongly considered those as well.
Funny you mention the home vs car thing. When I decided to make this purchase, I realized how I must becoming an adult. Still spending money on toys...it's just that the toys have been upgraded and are more refined. My car is still a hobby of mine, but less so in the stereo department.