no, the stretch looks stupid. you have a wide wheel that can support a wide tire. use it.
275's fit well on my 9.5's.
As for susp, I went with some older Tein HA's. I originally wanted just a new set of Koni's with a Ground Control Setup, but that was going to cost me $1200.... I was able to snag some lightly used HA's with new mounts for a little under a grand (perfect spring rate of 10k/8k) and I cannot BELIEVE how much better of a car this thing is. I had a track day before the susp and it felt like a boat (notice the body roll in my sig). The track day afterwards felt comparably orgasmic.
Anyway, do susp you won't regret it.
As for tires, 245's up front and 275's out back. (but I believe that 255F and 285R should fit aswell).