Here are a few other options I've read good things about that list sizes available for you.
Streetable Track & Competition
Continental ContiForceContact (sizes are very limited)
235/40/18 Square
http://www.tirerack.com/tires/tires....tiForceContact
Pirelli P Zero Corsa System (sizes are very limited)
245/35/18 Square
http://www.tirerack.com/tires/tires....o+Corsa+System
Extreme Performance Summer
Bridgestone Potenza RE-71R
235/40/18 Square
255/35/18 Square
Dunlop Direzza ZII Star Spec
235/40/18 Square
255/35/18 Square
Competition Streetable-ish
Nitto NT01
235/40/18 Square
I was looking at the offset of the wheels you mentioned and they will work fine for the front but you might run into issues on the rear. The stock M Sport rear offset is ET52. By having a lower offset (i.e ET40) the wheel will be further out towards the edge of the fender. IF you haven't purchased these wheels yet I would try to get at least an ET45 for all four.