HDMI is HDMI
HDMI is HDMI for the most part. Read the article Bob linked, then read it again for good measure. Maybe even read it a third time just to make sure everything has sunk in. Just go out and buy the cheapest HDMI cable you can find. At the typical 1-3m lengths, there's no difference at all. You shouldn't need to pay more than probably 2-3 quid for a cable, maybe a bit more after VAT.