Thanks for all the useful replies.

For now the Z4 trade has been put off, the deal fell through when the dealer would give me $6,000 less on the trade for the xfire than he was willing to give me in early august!

this meant the deal was my car + $29,000, that was a no brainer...

I have been debating about waiting for the 135i, but its looks don't do much for me.

I am also waiting to see what the 2009 350Z might be like...but if they keep the same vQ brutish engine in it, it will again be a no brainer...sounds like a coffee grinder from inside the car as car and driver put it.