I recommend monoprice as well, with blue jeans coming in a very close second, only due to price.
I use mono's premium hdmi, or what ever they call there top o the line cable. I have 2 16 foot runs, one for cable, the other for blu-ray. I think the picture is fantastic. I have done some comparisons with othere cables, which were shorter and could not see a difference.
There premium cables are VERY stiff, so keep that in mind.