I decided before buying my new Zed that I don't like the 108 style, and found some lush alloys that I much preferred. Here's the before/after. I'm running on Fox Racing wheels now. I think the colour really complements the stirling grey paintwork.
Yes I was considering new caps, but don't want to go for BMW ones. I think that'd be BMW badge overkill (as I have door lock pins with the BMW badge on, too). Not sure what I want yet, but when I find a nice one that suits the styling I'll stick 'em on.