So get the model take it to john Lewis they will price match and give you a 5 yr warranty!
+1
or richersounds who will give you a 5 yr warranty if you join the vip club (simple email sign up).
Samsung, if you're watching films from an hard drive then odds are you'll want one that supports DTS codec, Samsung does this, pretty sure LG don't have the licence for it.
If you do go PC world ask about DTS support from USB devices, odds are the
technical staff will cry or look blankly at you.