1080i = HD, so yes, your TV is ready. HDTV is 720p *or* 1080i *or* 1080p. If your XBR is the same as mine, it does 720p and 1080i--*nobody* does 1080p. (Some video junkies will tell you 720p is actually superior to 1080i; I bet 1080p is fantastic). Although to get 720p/1080i on my XBR I have to futz around with the video menu--I can't get the "autosense" on video 6 to work well and have to turn on the HDTV aspect ratios manually.
They can output normal signals through component, so you only need component cables--forget the SVideo. Comcast in this area provides a coaxial RCA digital output, which will pass 5.1CH audio.
They can output normal signals through component, so you only need component cables--forget the SVideo. Comcast in this area provides a coaxial RCA digital output, which will pass 5.1CH audio.