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Leica M9 Rangefinder...
This is what I bought (used) and it's my UWA through 50mm and 90mm solution. It's FF and the lenses are much, much smaller, than EF L series. I still use a DSLR for telephoto AF.
IMO, most of the mirrorless systems are great for reducing bulk and weight if you're dealing with normal and wide angle work, but telephoto options are less enticing. The best is probably m4/3, such as the great new Olympus lenses, or the higher-end Panasonic glass because the smaller format allows for considerably smaller lenses. With APS-C mirrorless formats, tele lenses will be similar in size and weight to regular DSLR glass, so really not much gain IMO.