Looking for any advice on which 3D TV I should get?

Noob here,

Well I've decided it's time for my crappy 42" Sanyo to go.

I've narrowed my choices down to 3 and would like advice on which one I should go with or help understanding the advantages one may have over another. Any other suggestions if there's a better option for around $800 would be a help as well. Main uses will be for watching sports, xbox 360, and blu-ray movies. Any assistance in making my decision at all would be greatly appreciated. Thanks in advanced!

http://www.lg.com/us/tvs/lg-55LM4600-led-tv

or

http://www.lg.com/us/tvs/lg-47LM6200-led-tv

or

http://store.vizio.com/led-lcd-hdtvs/m3d470kde.html

Thanks for the reply, yeah I've been leaning towards the 55" just for the bigger size. That's really the only difference between the tv's is that the 47 is a smart tv and the 55 is not right? If so you're right, I don't really need any apps with xbox and a blu-ray player.

Yeah, so I guess the 55" will be my best bet. Before I decide on this one, does anybody know of anything better than the LG I should check out for around $8-900?