I am not aware of any TVs on the market higher than 1080p. Doesn't mean they aren't out there, just that they are so rare I haven't seen anything about them. Maybe something was shown at CES and I didn't catch the article.
But...1080p is the current best standard for HDTV. And I mean there is a standard so it will last you quite a few years. Not to mention there is some argument as to if you could differentiate any higher resolution with your human eyes. Higher resolution would be more evident on bigger sets, but for 42" and below on a quality set... I doubt you could see a difference.
The biggest thing going on HDTVs now (besides 3D) is the quality of the black color and the refresh rate to avoid blurring during high speed action. The plasmas are typically better than LCD on both accounts but technology is rapidly helping LCD catch up. The newest non-3D sets announced at CES seem to focus on better black color and refresh rates improvements.
As for 3D, it is a new technology and I wonder if there is even a standard agreed to by the industry on how to broadcast that signal. Anyone know? But one thing to consider with 3D is you will need glasses. At about $100 a pop for each pair (at least for the Panasonic), it gets to be a pretty pricey feature for more than 2 viewers.
As for HD channels, DirecTV has quite a few and I really enjoyed watching it. But they were such incompetent and ignorant bastards when the satellite receiver died that I dumped them for cable. I had been a 9-year customer too and I was pissed that I knew far more about their equipment than their own tech people. My cable company is Time Warner and they have a decent selection of HD channels. At least they carry about 100 or so and the ones we watch. So it works for us. There is always the off-air signal too. But my HDTV is so old that it doesn't have a digital tuner.
Not sure I really answered your questions. Personally, I am going to wait and see about the 3D technology. I'm just not convinced as my 3D experience at the theater didn't impress me. So I plan on upgrading TV to a 1080p plasma with the best black contrast color I can find and enough HDMI inputs to satisfy future equipment additions.