I've found that some of the cheaper distortion work very well for playing punk. Distortion like Danelectro, Grilled Cheese (I don't really like Danelectro, but for the sake being, Oh well). This should give a real trashy sound depending on guitar, pickups, etc... and the Danelectro Overdrive will give the steady distortion you hear a lot in bands like Bad Religion and AFI. The best thing to do is go to your nearest Guitar Center and try these distortions and find out which suits your guitar model.