I ended up going with 17" tires, but Don helped me with sizing. I ended up with 8" rims up front with 3.75" backspacing and 255/45 tires, and 9.5" rims in back with 4.5" backspacing and 285/40 tires (to give a little extra sidewall compared to the 275s).
Compared to the original 245/60/15s and 255/60/15s, front tire height is 26.1" up front and 26" for the rear vs. 26" front and 27" rear with the old tires. I've got pics of the old and new side-by-side that I'll try to post.
They fill the wheelwells nicely - I've got an 8.8" rear-end, and my car was a turn-key from CR in '92, so I don't know how that compares to your car. I have tons of clearance front and rear inside the wheels. Early on, I noticed rubbing on big bumps, but lately I haven't had problems. I've also got a set of coil-overs to put on (all it takes it time
) that should allow me to adjust to the correct ride height.
Good luck!
I just remembered I posted a page of before and after pics:
http://winkler.home.texas.net/jlw/new_wheels.html