Performance Superlites for a MK II

I am going to acquire a set of 13x6 Performance Superlites for my German RS: http://www.performancewheels.com.au/Hom ... at=Classic
The 13x 6 comes in two configurations:
13P offset & 101 mm backspace
23P offset & 111 mm backspace.
The car has standard arches and I do not want any rubbing. The guards are not rolled and I won't roll them.
The guys at the supplier seemed unsure which was the best configuration.
Also any suggestions on tyre size would be gratefully received.
Can anyone help?
Thanks
The 13x 6 comes in two configurations:
13P offset & 101 mm backspace
23P offset & 111 mm backspace.
The car has standard arches and I do not want any rubbing. The guards are not rolled and I won't roll them.
The guys at the supplier seemed unsure which was the best configuration.
Also any suggestions on tyre size would be gratefully received.
Can anyone help?
Thanks