I can exchange and pay $100 more for an A630. Is the A630 better PQ wise? I know that the A530 has better sound for sure, and thats important because i don't like to have my surround sound system turned on all the time (just for movies). Does the 120hz effect PQ overall, or just for motion? ANd the last question (and most important)....does the A630 have better off center viewing than the A530? Thanks