Which turtle beach headset should I get?

I'm trying to get the best gaming headset I can for about 100 bucks. I'm primarily deciding between the x31's and the px21's. I've heard the wireless feature on the x31's crackles and hisses and that the signal is easily messed up if your cell phone is around or something, but the px21's are a little cheaper, so which one is the best buy?