Chris14a

I have a 2001 spec c and it came across with standard wrx wheels which I think are 7j wide.

Im looking for different wheels this month and just wondered before I start looking what would be a good offset. I dont want to roll my arches as it is a track car but want it to look good so they reasonably fill the arches. But never had a subaru before so not sure. I will be getting 17x8 (aslong as they dont catch) but not sure on offset.
Thanks Chris