the E90/E92/93 M3 with DKG is available since BMW released the convertible E93.....it has nothing to do with the old SMG II of the E46 M3.
the actual M3's are good, but I wouldn't want one because everbody got them now....it has become a fashion accessory because BMW had to get on one level with Audi and their new models.
There's no racing pedigree left in those cars, way to overload with stuff you need for long Autobahn trips.
Quite a few people bring their new M3's to the Nürburgring though, but mostly they have a hard time with the M3 CSL's.
If you want to stand out, what's more of an Audi thing, you should buy the M5 or try to get the M5 Touring, I bet nobody got one of these.
If you want turbocharged M-models you should get the new X6 or X5, they'll be available soon.