Hi,
Do you like the 3D effect on currently available sets? Will you watch anything in 3D?
If yes to both you'll need to get a 3D capable TV. You'll also need a 3D source. BD or SKY are the only current sources - do you already have either or are they to be included in your budget? Choose as large a screen size as space allows.
I don't like the effect so won't be buying into it, my next TV upgrade may happen to be 3D enabled but it won't make or break the deal for me.
Cheers,
Cofnchtr.