Rims....what ones....

[gitchies]

So i recently put on my winter rims and tires, style 58.....18"(255/55/18)....wow, i must say the comfort level compared to the 20"(315/35 rears and 275/40 fronts).....night and day...
So now i'm considering using an 18" maybe 19" wheel set up for the summer. What i'd like to know, what other OEM bmw wheels would work, say some 5 series or some 7 series ones? Any suggestions would be great!!
like style 123 from 5 series,
like style 95 from 7 series...
maybe style 89 from 7 series....

i know the offsets on those are really low.....suggestions?
just wondering what my options can be....