I wouldn't consider either sets mentioned above without a good review in sight! Make that three opinions just incase.
The cheaper sets{EX 503] are V.good as a value for money product but they are still don't come close to the Samsung C7000 or 9664 Philips. So, I know I am sane in admitting this.
I do not think those NX TV will take the performance of Sony TV any further.[And having LED don't means it's better than LCD]Sony sets have reached its performance limit with the V,W,Z and the later EX 5 series.Unless it starts to INVEST more in R and D like Samsung thre is no more gain. Bravia 4 is an UNKNOWN. I am a Sony Fan but I ain't no mug.
Sony's glory isn't epitimised in TVs, not anymore - but in their A/V{amps,BR players], SE Phones[Vivaz,X10], music players,DSLR and HD Video camera, and on those toys they can compete with anyone!
I suggets you check out Samsungs if you want TVs performing above EX range. At £700 to £800 pounds Sony EXs are probably the best LCD TV you can buy.....even that's pushing it.....and I am been tenny wenny bias....Samsung is their nightmare.
My next TV will not be Sony.No A Samsung,or Panasonic.....still going on value.
'We all need a change'