Hi folks, I'm looking to buy a cable to enable me to connect my MacBook Pro mini display port to a HD TV via its HDMI socket. In fact, I have 2 MBPs (one is Sept 2009 and the other is May 2012) and I think the different models may be significant???. I know cables exist at different prices but some claim to have better "performance" than others, and some don't seem to transmit the audio. Can someone clarify whether the cheaper cables really do have lower performance, and whether they would or not carry the audio (as well as the video) from my two MBPs. Thanks for any help offered.