Before I bought mine I asked the dealer if IS200's would fit, they said they wouldn't because of the offset.
I eventually bought some aftermarket 18's & tyres, they transform the car but you loose a bit of ride comfort. On the plus side they hold the road very well with a wider tyre. Took a few mile to get used to cornering again, on standard tyres seem to get a slight delay in cornering (think its the larger tyre wall), with low profiles it's an instant responce.