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I just purchased new 18" genuine JCW wheels with tires, hubcaps, and tpm's for only $1205 (for all 4) to replace my 16" wheels. I found them on www.shopminiusa.com. They must be on closeout or not very popular as all the other 18" JCW sets are $3000+. They are a 2 piece silver composite design. A great deal if you are looking for some new wheels or an upgrade. Note the website says its only good for models until 9/2009.
I picked up a set of 18" R-105 wheels with Pirelli P-Zeros last year for the same price. The Pirellis changed my opinion of run-flats (for the better). Helluva deal.
BTW: I also take some comfort (no pun intended) in the stiff sidewalls of the runflats in conjunction with the low profile 18" tires. A bit of rim protection.