Personally, I've seen just about all of these, and I really like the R/W builds. The B/W build is my second favorite, and even though the unblockable is nice in U/R, the B/G is a pretty sweet setup too. I have a R/W build, I can provide a deck list tonight if interested that runs 4 Lieges and 2
Nobilis of War s which are great with double strike creatures. The build still isn't perfect, ...