I'm seeing a lot of people that I believe would be terrible choices. Not because of personal hate for the person, I just believe that they wouldn't contribute anything to the community:

Sky: Doesn't play Survival, and has a very excitable personality that wouldn't mesh well with the Mindcrackers, has a very young fanbase that would contaminate the community.
Jerome: Same as Sky.
Mitch: Same again.
Aureylian: Was a member of the HermitCraft server, and that didn't turn out so great.
Jordan: Very popular, very young fanbase.
Syndicate: Said before that he doesn't wish to be in a server, prefers SSP and Adventure Maps.
Teras: Already part of a SMP server, one that he picked over the previous one he was on.

Now, my choices:
X: Great friends with all of the Mindcrackers, actively plays MC.
Coestar: Recently announced that he was coming back to video-making again, great mates with the Mindcrackers.
Noxite: An unknown, founder of the Noxcrew. I feel like he has the same humor as many of the guys, and would mesh well. Not many know him though, which is a damn shame.