For more expensive decks, I use Dragon Shield Sealable Inners

For less expensive decks, I use Dragon Shield Perfect Fits

For outers, I have transitioned completely away from Dragon Shields to KMC Hyper Mattes

All my pauper decks are sleeved in BCW Elite 2 Matte sleeves, because I found a good deal on 1000 of them. I actually like them more than Dragon Shields too, their shuffle feel is better to me. Personally, I find shuffling DS sleeves that they stick together more than the KMC's or the BCW's. On the opposite end of that spectrum, I find Katanas to be too slippery, I've had decks fall over on the table if they weren't stacked carefully.