Flashgun for M6

Can anyone recommend a nice compact flashgun to use with my M6?

I am not a big flash user, so I don't want to spend a fortune. I want something small and compact to keep in my jacket pocket for those very rare occasions when it is necessary.

Been thinking of the Metz 20C2. Any other suggestions please guys?

If you do not insist on TTL flash metering virtues - I'd heartly recommend t check out Sunpack Super 383 model. This one is not expensive (under 100$ new) yet handles excellent exposures. It is auto-thyristor model - has a built-in sensor to sense the light amount and cut off the output.
I used it several times no indoors events quite extensively (in total about 5-7 rolls) - was really pleased by very consistant and precisely exposed images.

Having said that, the unit proabbly will not fit into a jacket pocket (unless you have some really big one...)

Well, it's $$$ but the Leica SF 24D TTL is pretty, small and works with your camera. Comes in black or chrome.

Xmm, can't see any reason (aside of camera fetish) of paying 270$ for Leica flash while theer are probably less pretty but robust, reliable and much more reasonably priced units from Sunpak, Vivitar...I found auto-thyristor models (at least sunpak 383 Super) works beautifully on Leica, producing precise and even flash exposures (albeit didn't use it as fill-in in daylight). Besides there is an improtant feature like swing/title available on those, which isn't on Leica flash.
Just my HO...