For reference, my sources claim a width of 67.301" on the Integra and 68.5" on the Z3.
I'm thinking that almost anything is going to be wider than those.
And I feel the need to point out that I haven't had any real reliability problems with the Volvo. It has been in the shop a number of times, but that's more due to the shop's incompetence than problems with the car; I've only had about three problems, but it always seems to take then\m two or three trips to get things right, including bothering to order the parts that they need for the problems I've told them about beforehand.
Plus,
the empeg fits pretty well, if you hadn't seen my post before about it.
That being said, I don't think I'd reccommend anything other than the R. I've driven a lot of them as loaners

and they all suck. They drive like boats and the interiors feel cheap -- even the leather. (Maybe I'm just spoiled, though.) Of course, they haven't given me a T5 as a loaner, only base models.
Or you could go full-on family and get a V70R wagon.
And, by the way, congrats to you and the wife.