I'm a Direct newby. We have a 47 in. SONY HD-ready projection TV. Our HD picture quality is was decent with Dish, but noticeably better after we switched to Direct. We aren't presently hooked up with an HDMI cable. Will it make picture quality any better to buy and install an HDMI cable? If so, what kind should I buy. I am stunned at the costs I'm seeing for a 6 foot cable at Wal-Mart. I found a site on Google that suggested that there's little or no difference between a cheap one and a high-priced one. Any suggestions?