I'd stick with the one you got, after all its sitting in front of you. There is always some something new just around the corner to wait for, you could wait a lifetime to buy the next big thing because there is always a new next big thing.
Plus without two TVs next to each other the layman can never tell the difference between 1080 and 720, even two same brands next to each other I often get it wrong. (the company I work for does all this AV stuff).
Don't panic and get playing!