I have a cheap HDMi cable atm which is awful as it keeps losing picture.
I've always thought it made sense to spend a bit extra to get a well built cable but I can't say I've ever come across a cheap thin HDMI cable before so unless you need a specific colour it does seem a waste to spend over the minimum.
The cheapest I can find at - is £19 for 5m.
Off the record QED are working on a way of testing and proving differences in HDMI cables - obviously not easy but in their interest.
This will cause huge debate now and at the time - however it will be very interesting if they can do it.