I'm going 225s soon but it's so hard to find a damn tire that I like and that will fit 15" wheels. I don't expect any rubbing at all. Might have to stick with a 50 or 55 series sidewall though.
Brand: Toyo
Model: Proxes r888
Wheel offset: 38mm (ends up being 26mm with installed 12mm spacers). Perfect offset if you ask me.
Rolled fenders: Yes, and needed.
Rubbing: 205/50/15s rub in the rear on the underside/outside of the fender with 4 passengers over giant bumps after lowering with Road Magnet springs. 225/50/15s shouldn't be too bad either. If they rub under normal driving/racing I can take off the spacers or just run this size in the front and keep rears 205 width but I don't predict any real rubbing.
http://www.racetire.com/products/toyo_r888.htm
Those Toyos really like to be hot though. I'd love it if the Falken Azenis tires came in a 225/xx/15 size. God damn it. I'm worried about street driving though. If you're hitting the track you've got a bunch of options. The Toyo r888s would be great, and there's some BFG and MT tires that should be fine too.