personally, I'd be going for maybe a 235/45/17 up front and a 255/40/17 up the back. If you've got room for bigger rubber up the back you may as well use it.
The reason I bought 17x8 and 17x10 algernons for my car instead of the TE37's I was going to get was simply because I didn't want to run 245/255's all round