Of the ones you list, I would recommend Northern Brewer and Austin Homebrew without reservation. Midwest has had some major issues with the quality of their crush. I also recommend Brewmasters Warehouse very highly for ingredients, but not kits.
The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Planned: Farmhouse Saison hopbursted w/ Nelson & Galaxy, sLambic II, Flanders Red, Orange Blossom Mead
Primary: Karneval Kölsch 9.0, FonBrew Brown Ale (brewed in Fondue pot), sLambic I
Secondary: Winexpert Riesling Ice Wine, Flanders Red
Kegged:Black or Blue EyePA
2013 dump volume: ~2 gallons