Put Netflix on it, I found the XBOX interface better than the PC version!
Internet Explorer (Ok, it's not everyone's favorite browser) is coming to the xbox soon, it does a good job and a web browser, full screen, on a large TV is pretty sweet! I've ordered a keypad for the xbox controller so Internet Explorer is easier to use.
That way you could get a regular TV, but a much better one in terms of picture quality / refresh rate than a smart TV with lower specs. Try the xbox out and see if you think it'll give you the 'smart' features you want.