Hi, I am looking at buying a RPTV and am deciding between the Hitachi and Panasonic offering in the 51-53" range. I can get the Hitachi H51F510 at a pretty decent price (cheaper than the Panny PT-53X54). For about $230 Canadian more (~US$160) I can get the Hitachi Ultravision 51S500. Is it worth the extra cash? I am trying to decipher what some of the specs mean. The Ultravision's biggest feature diff (that I can work out) is that it has a 5-element lens system, which the F500 does not have. What does that buy me? The room its in gets lots of light during the day (we mostly watch in the evening) so would any of the Ultra's features help with this? Plus, I'll probably still watch a fair bit of SD TV, so would like an RPTV that will perform as well as it can at that task. Beyond that, here's some differences in a semi-table: F500- -S500 Ultravision High Brightness Lens/CRTs- -Super Contrast Lens/CRTs N/A- -Day/Night Mode Memory by Input N/A- -1080p processing N/A- -Adjustable Colour Decoder N/A- -4 step edge enhancement N/A- -4 step black enhancement Can someone decipher the value of some of these features "in the real world". Are the Ultravision RPTVs that much better?