For everyday use, I like to use just a regular Innova champion mini, although occasionally I'll bust out a mini driver from the MSDGC with the 4 interwining baskets logo on it.
If it's a big tournament, I like to use a metal mini that says "Flying Squirrels Amateur Doubles Champions" that I won with my dad like 3 years ago.
As for coolest looking ones, I have several of the mini UltraStars in full color: one with the "Fly the Colors" eagle/American flag, one with a tiger and a dragon ying-yang symbol, and a "Suercolor" 2nd 1st Run Buzzzz fundraiser for the Player's Cup.
Oh, and Mark Susi made WVO minis as trophies for the winners of the Maryland State Disc Golf Championships at Druid Hill in Baltimore this coming Sunday. I'm planning to win one of those...
"a man is a success if he gets up in the morning and he gets to bed at night, and in between he does what he wants to do."
-- bob dylan