My first vote goes to the Nords, seeing as Skyrim is the homeland of the Nords, and Nordic culture is pretty damn awesome. The next two would be a toss-up between Orcs and Argonians, but I chose Argonians first for this poll, simply because I played a lot of Orcs in Oblivion and would like to change it up this time.
There is no choice for other.
I like to use custom races a lot. You'd be hard pressed to get me to use 90% of the races in the game.
Also there isn't an option for which races we'd never play.
My never votes are orc, kahjiit, argonian, nord, high elf, and redguard.
We are talking about Skyrim here, not modded Skyrim. We don't even know at this point if modding custom races will be possible with the Creation Engine (it probably will be, but you never know). I think it is way too early to start considering mods.
Also, 90%? Seeing as there are only 10 playable races, that would mean there is only one race you would use.