Anything smaller than 16's on an FC is a waste of time, cuz you'll need a 60 series tire to fill up the fenders, unless you've got coilovers, in which case you could afford real wheels.

16's look nice w/ a 45 to 50 series tire (depending on width) The 205's are fine for N/A but TII's should have had 225's from the get go IMO. The stock offset is +40mm on a 16x7 wheel. So +35 on a 16x7 will put you pretty much flush w/ the fenders. For an 8 inch wheel somewhere between +25 and +35 is where you wanna be.

17's is the biggest you wanna go on an FC. Austrailians love to throw on 18's and sometimes it looks ok, sometimes not. But performance wise you're not gaining anything. And the tires are a heap more expensive.

That being said, the widest you can fit in the front w/o over fenders is a 9inch wheel, and that requires some pretty decent camber and the right offset maybe some fender rolling. In the rear, 10's maybe 10.5's