I use a Tortex 1 mm, the light blue ones, for performance. For practice I use the light purple tortex 2 mm picks. Practicing with a heavy pick makes playing with lighter one much easier in my opinion.

Occasionally I use a 1 mm steel pick. I have no idea what brand it is, because it's solid steel (super inflexible) with no logos or anything. I love the bright, twangy sound it gets (for lead... strumming with it sounds horrid!)