I've started giving this advice on picking a mid:
What do you love to throw? When you step up in the box, what do you want in your hand? Imagine what that disc looks like and feels like in your hand. Now, was the disc you were thinking about a driver? Throw a Buzzz. Was the disc you were thinking about a putter? Throw a Roc. Was the disc you were thinking about a mid? Throw that.
In this case you can substitute "Comet" for "Roc" and it still works.
I really like that way of thinking about it. I know my favorite discs to throw are putters, and I love my rocs.