XL
I agree, Affliction has spread like wildfire in the States (though NO ONE here in Costa Rica besides me and Fuzebox own any I'd wager

)
I buy a tshirt based on if I like the design or not though. I own two Affliction ones because I liked them, I also own $5-7 tshirts from Wal-Mart because I like them and $3 fake tshirts from the Costa Rican mall because I like them
Generally though I don't own any of the sports brands, stuff like Ed Hardy, etc... because I just find them ugly and not my style.