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I've not got the Birds set up but I have the same car, nearly the same year. It's December 2009 325d E91 SE with 18 inch wheels.
I put the Eibach Pro springs on with Bilstein B4 (msport spec) and the ride has been transformed. Much better handling and really settled on the road especially at motorway speeds. No problem with speed bumps at all.
The only other thing I might do is fit Msport anti roll bars. I would have done it but you have to drop the rear subframe frame to fit the rear one.
I've heard good things about the Birds set up however the cost was just too much for me.
Hope this helps!
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