White is my favorite color. I have a "White Supremacy" deck for that reason
I also have a 5-color commander deck that I am truly in love with due to so many different possibilities and directions the game can take.
However, the combo I have the most fun with is White/Blue. For me, there is nothing more fun in Magic than to spread Azorius Law & Order all over the battlefield, not to mention any number of other White & Blue spells scattered throughout the rest of the game that, obviously, tend to fit in very accordingly.