Just being slightly better than the cable company's garbage won't cut it for much longer -- again, the Media Center PC kicks your ass right now, and the high-end customer on which you're currently relying is going to figure that out soon.
Make sure to look at the address bar at the top of your browser to double-check that you're at the right site--for example, if you accidentally type "bestbbuy.com" you'll end up at a site that looks similar to Best Buy's, but is decidedly not.