Mango is 1st, only losing to Kage and Armada recently when actually trying, but neither may be consistent, until they meet up with him again.
Amsah, Hungrybox, M2K and Armada are 2nd-5th in some order. Armada is better than M2K until tourney results prove otherwise, likely Hungrybox as well, but we're not sure of Amsah until he meets up with M2K and/or Mango in tourney.
Following those are all the other good players including Hax, SilentSpectre, Darkrain, DaShizWiz, Dr.PP, Lucky, JMan, Zhu. Maybe Tope as well as he's done really well in the big tournies.
And there's still several good players we're not sure about at all yet until they meet up with North America's top player such as Javi, Twin, Ghost, Dark, Calle W and Star.
And of course a lot of players are amazing in Teams, but not as awesome in Singles (such as L0zr and Bam).