There aren't any 17x9 wheels that will fit on your car without lots of fender work, camber arms in the rear, camber plates up front and you'll need to buy those coilovers you are seemingly giving up to get wheels.
If you want to get wider wheels then so be it, but on stock suspension 7.5" is really as wide as you'll want to go. As you go lower (and your suspension gets stiffer) you can get wider and wider wheels.
Feb 2011 Ride of the Month ~ 2011 Hatch Nation Hatch of the Year ~ 2011 Focus Fanatics Ride of the Year!
Hatch Nation #2