According to the Toshiba site, the only differences I see listed are size and the 34HFX84 has these 2 items listed: Dual Tuner Double Window Picture on Picture (POP) SD/HD Multi-Scan Double Window and the 30HFX84 does not. well and speaker difference. what do these 2 features do? could they be ommissions and will I miss them? POP is no big deal but what is "SD/HD Multi-Scan Double Window"? anyone compared these?