Vizio has always been the value leader among LED LCD TVs, and its M series reaches new heights of style and solid picture quality. Note that this recommendation only applies directly to the 50- and 55-inch members; we haven't reviewed the other sizes yet, so we can't vouch for their picture quality.
Over the last couple of years Panasonic TVs have followed a pattern so simple, a caveman could remember it: Plasma good, LCD bad. The excellent E60 series bucks that trend, offering impressive picture quality especially at this price point.
On the other hand we have reviewed a bunch of E series TVs, and we've liked them all from a value perspective. The mid-sized E0i models linked below (from 39- to 55-inches) are great examples, with very good picture quality helped by solid local dimming. Meanwhile the 32-inch, 60-inch and 70-inch sizes lack that dimming, but they're still good performers and still current models (as of late October 2013) despite their 2012 review dates.
On the other hand, if you happen to love Samsung's Smart TV suite, the F6300 is also very competitively priced, and available in a larger range of sizes too. LIke the F5000, it also delivers good picture quality for a mid-priced LED LCD. Ho ho ho!