I have an LG 55" 3D and very happy. There was no premium for the 3D when I bought so why not go with 3D? There are two types of 3D; active and passive. The former requires more expensive (proprietary??), bulkier, heavier, battery operated glasses, the latter does not. LG uses passive, Samsung (I believe) active. In terms of programming it varies by provider, but there is not much out there as of yet.. I am on Shaw Direct satellite we get occasional free 3d programs and I believe a PPV 3D channel. For the most part you are limited to 3D Blu-Rays of which there is a rapidly growing amount.
LG, Samsung and Panasonic are the 3 brands too look at IMO -- LG are likely the cheapest good quality TVs, Samsung builds a good product priced a little higher and Panasonic are great if you have the $$$ and couch potato enough to warrant a higher end TV like that. LG IMO, are the best bang for the buck for the casual viewer.
If you are concerned with such matters, LED TVs will hurt least on your monthly Hydro bill, Plasma most. The power consumption difference is not insignificant.