Going HD - Should I dump DirectTV?

I am about to make the leap to HD with a plasma. It seems that cable options are better for HD, with just as much programming plus the locals without having to go through the hassle of an over-the-air antenna. The only sports package I get is the MLB extra innings, which is also available via cable. I have seen a couple of threads on the AVS forum about DirectTV adding satelites, requiring a bigger additional dish, etc. The only thing I am unsure about is Tivo. Is Tivo available for non HD on cable? It seems like cable is a better option for HD right now? Any help is appreciated.