I also have a lowering kit on my car, PTFB's GT kit, and I am going to use 285/40 on the rear and 255/45 on the front. YearOne used a 275/40 all the way around and looks really good if you can get your fender gap to look right. That is why I went with the tires above because they are a little taller then the 275/40.
Kevin's car above also has the hotchkis lowering kit. I think he has 255/45 all the way around, I think? Am I right??