BimmerJon, if you can't get your mind off the car that means it's too late. Put in your order now for a timely delivery.
No need to fight the urge either... I tried but miserably failed. It was the best failure I had in my life, though.
I've got 5700mi on my beast already (5 months new) and the engine's running quite smoothly. Aside from the typical QA issues that I had to have the stealer sort out (I finally accepted the fact that reliability isn't as high up there as the Japanese makes), there's not a whole lot to complain about. The Z4 is a proper sportscar that doesn't seduce you with useless bells and whistles like some other cars do. It just tells you to "come in, drive me as hard as you like, and I'll take care of the rest." At least that's what my Zed tells me every time I look at her... or maybe that's just my schizophrenia.
"Less is more" is a term that's both good and bad but applies well to the Zed IMO.
**edit** Oops, I guess you mentioned that you already put in your order. Congrats!
The only 2 major things I consider rubbish are the cupholders and the poor remote reception.