Please don't put smoked. Not only is it less visible, it looks tacky and IMO that kind of look does not belong on a BMW. Unless you have an Alpine White paint job, I would not even think about it. I prefer the look of RCR tails, with chrome bulbs (no orange look in the signal socket), but I'm biased because its what I have.
The first time around, Khoalty messed up my order and I received smoked by mistake (they took care of it, great support). Just take a look at these smoked RCR's. IMO, they look "unpleasant" to put it nicely
Be prepared to do some soldering down the road if you decide to go with DEPO LED tails, they tend to have bulbs/rows go out because of the way they're wired. Its not a big deal, but just be forewarned.