Walker, I find it very easy to spend other people's money, but try to get me to spend my own....
The cables that will come with your PVR, assuming that you got the Shaw HD PVR, and not the regular digital PVR, are component video cables (red,green,blue).
This is the same technology that has been used to get maximum picture quality from DVD players for 5+ years.
You will see an increase in picture quality vs using RCA cables (red, yellow, whie) and even a s-video cable.
To get the "true" HD picture you will have to use a HDMI cable.
As I said before there are probably 100 different brands that will make this cable, 95% of which will all have higher, noticiable in my opinion, quality than the component cables. The brand that you select is up to you and how much you want to spend, but after buying the TV and the PVR, I think you'd be a fool to cut the last corner and not pick up the HDMI cable.
On a second note when you get the PVR installed, try running a comparison between the 1080i signal and the 720p signal from the PVR.
The upper tier tv's are all rated for 1080p but the shaw box does not send a 1080p signal.
I found the 720p signal from the shaw box to be higher quality.
I don't think it really matters how you set everything up, the habs won't look good in any format....GO FLAMES!