Hey Beem, long time... unfortunatly I've been flat on my old & broken back for awhile now. Congrats on the new Beem!! Yours is a sweet bodystyle... and I understand its got a few ponies under the hood also.
Since I was bored while unable to move, I went and did new wheels too... along with new horsepower, new suspension, new brakes, new tint, etc, etc (yes, I was very, VERY bored!!). I'm embarrased to post pics here since my ride hasn't seen a drop of polish since my first surgery in Sept!! Attached is the best shot I have at this point... trash cans and all!!
If at all possible, I highly recommend you go with 19s. I was concerned about ride, etc, so I tried both 18s and 19s... and 19s are the way to go!! What's amazing is the visual diff between the two... its only an inch, but visually they're worlds apart. And for the ride itself, you know how bad the roads are around CenCal, and if my busted-up back can take it you gotta know the ride is still plush. I'm sure your Beemer will be the same.
PM me is you're interested in more info... I may have a nice hookup for you with a large assortment of wheel/tire package discounts. Congrats again on the new ride!