Steve I found that Dunlop offers a 235/45/17 and or a 245/45/17 for your front and a 255/45/18 for the rear in their Sport 9000 tire. My cousin had this tire and really liked it for spirited street driving.
Basically you have the tire sizes you know will work now it'stime to go shopping! I prefer to use
Tire Rack to see whats available, they have all the info you need. Just do a search by 'tire size' and go from there. Once you find a tire you like from the list you can check out the 'specs' and see if they offer the other needed size as well...I would start by searching 245/45/17.