Although I won't be suckered into buying a seventy quid (or more) cable, I wouldn't buy a cheap unbranded one either.
Having spent seven hundred quid on a Panny telly and recorder, fifteen quid for their own brand HDMI cable seems reasonable (although it might've been nice if it had been bundled with the recorder).
Very plain, but looks good quality. Once hooked up it the signal seems perfect, with no difference between using telly and recorder tuners and (unlike for some other cables) no interference to/from the adjacent aerial RF cables.
The right one.