Can a rear projection television really deliver a HD picture?

I own a Hitachi 51F510 rear projection television. There is an option for Simulated HD but I never see that image layered effect that I see on flat screen HD televisions. My cable box has the 4-5 HD cable inputs but I don't think that I am getting my money's worth. I don't know whether or not to buy a new TV or just cancel my HD cable service. What should I do and how can I tell if my HD signal is being processed?

The Hitachi 51F510 is considered an HD-Ready TV. It has no tuner but can display in either 720p or 1080i, so it should work just fine with your cable box.

To get HD, you need to connect it using either a DVI cable (or HDMI to DVI ) or Component video (Red/green/blue). Make sure you set the set-top box output to 1080i or 720p.

So, no need to cancel your HD service, but make sure you take full advantage of your TV via correct setup and cables.