Hi Pete.
Loads of experience. Fantastic cars. As with most things like this, servicing before time by a respected specialist is absolutely key as are interim oil changes. Treated well they're very well behaved.
DCT is absolutely fantastic and was way ahead of the game at the time.
Engine is an absolute PEACH. Loads of energy and high revving V8 thrills.
What are you wanting it for? A cruiser or a weapon? They're really great out of the box and they're pitched just right for eating up miles plus having a bit of fun.
I was actually looking for an E92 when I bought my E46. Could have had a very nice one, but for me, the more raw driving experience and the MUCH better steering (especially with the CSL steering rack) from the E46 was just so much better, even more so when coupled with the CSL airbox and Alpha N mapping. In fact, if I had your money, I'd be buying a CSL for sure. Prices are rocketing and you could drive it for years and still make money on it probably.
If it must be an E92 though, I'd go with the best spec'd one you can find with a carbon roof and DCT. A competition pack one if possible. And then get some
Evolve Automotive goodies! Stage 2 is very very good indeed. And I have a friend who had a charged one that was simply mindblowing.
Again, you don't seem short on money (guess it depends on how much of the funds from the Lambo could be thrown at the BMW) so maybe you could look at a Manhart Racing car. They really are the very best in the business and have utterly insane performance. For an example, look
here and
here. They have a dealer in Beijing...
Hope that helps Pete. Good luck, let us know how it goes!
Mes