There is a big push to stop people charging stupid amounts of money for HDMI cables, it has been proven that the performance of the cheaper and more expensive cables is identical, just make sure you get one that is HDMI version 1.3 compatible and you wont have any problems.

1.3 has a higher data rate, therefore the cable need to manufactured to higher tolerances.

All of the Sony HDMI cables are 1.3 and quite cheap too.