I'm a big fan of the Dragonshield Matte sleeves. The old forula for KMC Hypermattes is really good too however thier quality as since tanked very hard since the company changed ownership.
Another popular set of sleeves is the Ultra Pro Eclipse however I've had bad luck with them. Out of the package they have such an amazing shuffle feel though they're highly susceptible to warmer temps. I made the mistake of leaving my backpack in the car for like an hour and the sleeves went from a wonderful shuffle to this gross-feeling clumping disaster. On the flip side, the Dragonshields I had in the backpack as well couldn't of cared less.
If you're ever wondering what the best options are for sleeves, deck boxes, and binders I would suggest checking out the Professor.