Instead of the Leica M9 why not just get the D3S?
I think the 7D is there because it's the closest canon has come to a Nikon :^)
Despite it's "problems" it's pretty solid competition to the D300/S.
The D3X is there because of it's incredible image quality, but I doubt it'll win since there's nothing really revolutionary about it. Previous winners have all been cameras that "redefine" the market.
Previous year's winners:
2004 Nikon D70 (Nikon's first consumer DSLR)
2005 canon 5D (first "affordable" full frame)
2006 Sony A100 (Sony's first DSLR)
2007 Nikon D300 (for being so awesome)
2008 Panasonic G1 (first mirrorless "DSLR")