I bought three 6' HDMI cables and a HDMI > DVI adapter from monoprice.com about 1.5 years ago, and they have been great.
All plug snugly in the ports on my 32" samsung LCD, as well as anything else I've plugged them into.
The DVI adapter is great for plugging my powerbook into the LCD.
From what I've read, since HDMI is a digital signal, either it passes the signal properly, or it doesn't at all.
No need to spend $$$ on expensive cables.