Have you had some trouble trying to find the right fit?
I had said try the buy & sell - theres heaps on there - problem is when you ring someone up about their alloys for sale all they seem to know is how many studs the wheel has - very little idea about PCD,Bore or Offset.
There are a few web sites that list all models with their wheel fitment sizes.
There are also a few second hand wheel dealers up the north - these may be a better bet though you'll be paying in sterling. I'd be v surprised if you got a nice set of 17's (with tyres) for much under €800 second-hand.
The advantage of dealing with the second hand wheel dealers is they may trade in your present set.
I had a picked from few nice sets and ordered them on the net with the Credit card, but after they took payment they phoned to inform me they couldn't get them in my size.
I'm still waiting for the Credit Card company to credit my account AGAIN So I'll have to wait for that - then go looking AGAIN
I fitted 18s a couple of weeks ago and got them for 1200 euro. Brand new 17s should only cost about 750-850(with tyres) even though they might be a special order cause of the fitment. I deal with robie in www.icetronix , hes a good selection and had tsw rid in stock. i was gonna go for them myself...
He also does finance payment options over as little or as long as you like. It might get you a set until your credit card pays out...