Ad,
We looked at the Wilwood Midilite under a stock BBS and it's not happening with the high offset, hi-spec calipers are a little less greedy with the room they need, I think some Chaterams run 280mm under a Compo CXR 13" rim, but they've got very low offsets.
14" BBS and 256mm Audi brakes are a nice combo, choose a pad/fluid to suit your needs and your laughing, won't cost the earth either.
Yoof