Unlike Blue Shirt above, I am an E fanboy. Um, fanman. Whatever.
Everyone who has said that T11 cards are thicker than Ghosts are correct. The Guardians, according to my measurements, are the thickest cards out there. If you're searching for a thinner custom card, the Ghosts are what I'd normally recommend. But in your situation, because you think Ghosts are too thick, stick with Bicycles or Tallys.
If you're looking for variety, something other than red or blue Rider backs, try searching out some of the different colored Bicycle decks (Target and Wal-Mart stores usually have plenty). Or search out Hoyle cards, which are essentially Bicycles with a different style. Hoyle's shell back cards are made by the USPCC with Air Cushion finish. You can get a two-pack at Wal-Mart; look in the party favors. Or search out Studs, which are exclusive to Walgreens.
I swear by Ghosts, because the finish performs better in fans and gives the deck longer life. Centurions are a close second; their style and handling are almost enough to push them over the Ghosts for my performances. (Is it just me, or do the edges of a new deck of Centurions feel more rough than other cards?)