[Leica] Leica M advice wanted

[InfinityDT@aol.com]

I'm planning to spend a (too-)short time in Europe soon, all the time in 
cities, on foot and on busses, trams, trains etc.  I want to take my Leica M 
outfit because it is more compact than my reflex outfit and I can carry it in 
a small bag (I have a Domke that's about the size of a Billingham Series 3 
plus it has a belt tunnel in addition to the shoulder strap for added 
security).  Last year I shot Royal Gold 100 and the results were great but I 
really prefer to have slides to project and so I want to shoot K25 and/or 
Velvia.  I have never used reversal film with a Leica (or any camera without 
a stepless electronic shutter).  I've heard that the shutters aren't all that 
precise but of course with negative film a half stop or so isn't as critical 
as with slide film. I don't have the time to send them for a professional 
speed-check ( I suppose I could do a down-and-dirty test roll against a solid 
background and check it against one from a camera that I know to be 
accurate).  I've seen Brian Bower's books full of Leica M work shot on PKM, 
so I'm inclined to think I've nothing to obsess over.  Any LUGers who shoot a 
lot of reversal film with an M system can help me out here?

Also, another quandary I'm in is: I want to take no more than 4 lenses, 
perhaps even 3. I'm a long-time 50mm kind of guy, so that's in the bag for 
sure.  Question is,  for European urban-type photography, which 2 or 3 other 
M lenses would you consider "essential" choosing from 21 ASPH, 28, 35 
Summicron ASPH, 90 Elmarit and 135 APO-Telyt.

Thanks for any help.
D.T. (which is what everyone calls me)