Hey Chirs, I have the same year car as you and live in southeast Mass. We should get our cars together for a reunion.
As to the original post... I think the BMW votes are probably right. I'm just not a big fan of the body work on the Z4. When it was time for me to buy a new sports car, I looked at the M3s (Z4 was not out yet) Vettes, Boxsters, Miatas and the S2000. Honda got my money. I'm not sure that means anything, but as a guy who always loved Healeys big and small, the Honda hit a note with me. Six years later, I'm still loving it.