I have spent waaaay too much time thinking about past seasons! My favorites for the first 5 seasons (i.e., the ones I would want to have a drink with) are: Austin from Season 1, Andrae (Andre?) and Uncle Nick from Season 2, Laura, Kayne and Robert from Season 3 (so shoot me, that was a righteous season), Chris March from Season 4, and Korto from Season 5 (the season I am currently watching and to me this is when they started casting for personality). I never understood how Christian won Fan Favorite when clearly he was an obnoxious little twerp. At least he wasn't mean like Jeffrey or Wendy Pepper (the one we all love to hate, although I did like her final collection). Vincent (season 3) was tolerable because he clearly had mental issues. Angela was just in her own world, but she did listen to Michael and Laura on the team Macy's challenge, toned it down, and won. I still find her whole spiel about the British art camp Jubilee Jumbles (during the dog challenge) to be the wackiest justification for a "giant bag of Skittles dress" ever.
I consider Keith Michaels (season 3) another bag of the douche variety.