I have a Vizio E421VA TV it's supposed to be 120Hz so I thought it would be fast and it is fine to watch TV on but the screen blurs and lags out when playing Rockband. I know for a fact it is not the Xbox doing it. People say plasmas are terrible because the HUD burns in to the screen even in the new ones so am I supposed to get a 240Hz TV? Are LEDs less laggy than LCDs or are they just prettier? Did I just get 1 random unlucky bad TV? Thanks for any help and if anyone could point out a $600-700 TV that is good for Rockband I'd appreciate it.