It all depends on the tyre size you choose and offset.
A 205/50-15 fits pretty well all around on +12 offset - maybe just catching on the front guard when turning.
So if your 17" wheel and tyre has the same rolling radius as that, and remains at a 205 width, then you should be fine.
I've gone to 225/45-16's on a +4 now, and they do not fit on the rear of a standard car (have tried it - thanks Avon) and required much front lip/apron and footwell/inner guard cutting to make fit on the front on full lock.
Some quick calcs:
205-50-15 rolling diameter = 586mm
205-40-17 rolling diameter = 596mm
Stay with a +12 offset, and the 17 might fit with a little tweaking of the front spoiler/apron lip.
Just remember, the bigger the diameter, the higher the car will sit unless you lower it more, which then reduces your travel.
Ash