I use good ole clay pots from Lowes
Seconded. I have pretty much all of my phrags in clay and they seem to love it. Clay is naturally more airy than plastic (even without drilled holes). Plus, the wicking and evaporation helps keep the roots cool and happy in the summer when it gets hot (if that matters for your area). As an added bonus, they are far less likely to tip over than plastic pots because they are heavier (the negative though is that they are heavier, so it makes handling things slightly more cumbersome ).