One of my favorite and most trusted Auto revieweres and testers is TopGear, you know the entertaining English guys testing cars all time. Well, for me it sums it up when they said the following:
1. for those who are worried about the Z4 heavy weight effecting handling, dont panic, the car handels as good as the previous Z4 and is even more fun in terms of steering feedback feel and corning ability. Also remember, you have 3 standard modes of driving, normal, sport, and sport+
they are the professionals and I take their word anytime any place.
The second issue confronting most of us is PRICE, the base car with premium pakge (a must) and few other options hits $53-$54k range,
so here is MY IDEA LOL, car goes on sale in May, hold on to your current Z4's and wait for 1 year, so lets say by July-August of 2010 you can easily knock 7-10K from a Z4 and there you go, you have a good deal.
You DONT have to get the TURBO one to be happy, I mean come on, 3.0L 255 HP is not enough, be real.