I am with you on the new designs. I am not a fan of the e36, but love the e30's and e46 (own a 2002). I am debating on selling my 325i and getting an M Roadster, but a part of me is telling me to wait until winter is over since I don't have a garage and don't want the Roadster to drive around in the snow.
The lines in the Z4, in my opinion, are ugly. I drove one and it was fun to drive, but I never liked the looks at all. There can be 800 bhp in the Z4 and I will still prefer the M Roadster. The rear end of an Estoril Blue M Roadster is sexy as hell.
I am kind of sad to see the new 3 series. I saw one the other day in person and it still didn't look good to me. I was excited about it, you know, the NEW 3 Series! But, oh well, what a let down. I hope BMW goes back to styling cars that will stand the test of time, not fit in the crowd of making odd, futuristic looking cars. The new BMWs are very ahead of their time. Maybe it is me that isn't ready for them, oh well.