Interestingly the old M5 v10 and the new M5 V8 (the V8 a backwards step BTW) are only sold with SMG/DCT in the UK, however in the US they both come with a manual box, strange??? Only found that a few weeks ago.
Also I had a SMG in my M3 e46 and it was good fun. Now have both manuals on the Z4M and M3 e92, however the Z has a Rogue Engineering quick shift installed which is great. However now every time I get into the M3 you can really feel the travel between changing gears (next mod to the M3 LOL). Also thinking about it, 13 years ago I remember my Honda S2000 having a fantastic 6-speed manual...
Anyway have to recommend a short shift kit, really aids the M Driver experience ... if you know what I mean, LOL.