I usually prefer two blue sabers and the experimental Jedi armor because it looks like the exact opposite of the saber guard's appearance.
If I feel a little dark I will always go with Sith Stalker and two reds; the Dark Apprentice's robes and eyes just feel too weird. I also like to use the ceremonial Jedi robes quite a bit.
My favorite colors are purple and blue, but my preferred upgrades are usually Shock, Disintegration, or Drain.
Does anyone else agree with me that lightsabers with pulsing/unstable crystals look stupid?
Also, I used to think that the black lightsaber looked awesome with the Sith Robes in TFU1, but in this game, it pretty much looks bad next to any costume.