As far as content goes right now Netflix has (from what i can remember)
Some documentaries
Smurfs 2, Hitch, Crouching Tiger Hidden Dragon, Philadelphia, Hose of Cards, Breaking Bad, Black List.
The Black List looks really good. Thats the most impressive show I've seen in 4k. The others are good and more detailed but nothing that blew me away.
M-go is said to start releasing 4k content and is supposed to have a good list quantity wise but i haven't seen it yet. For now its just Netflix and downloading 4k content from youtube.
If you need a tv now and its in your price range go for it. If you don't need one just wait until we see what each company offers in 2015 and by then you should have a larger offering of content. Im fine with watching hd(1080) pictures upscaled.