I have an HDTV which I love. My home theater system is wonderful 2.1 apartment sized system that acts as if it was a 5.1 system. My DVD player upconverts over an HDMI connection. All of this rocks but...

I have only basic cable :( lol!

The basic reception service does include a few HD channels. I am especially interested in PBS HD. (http://www.timewarnercable.com/sanan...ealacarte.html)

So the questions are,

What do I need to get the HD channels?
Will I loose my HDMI connection between the TV and the DVD player?
Is there anything that I must be aware of?

I am a total HD newbie, help!

Christopher