you're probably looking to get a 1920x1080 (1080p) monitor
3d-ready means that it boasts a higher refresh rate then normal (and a higher price tag normally). if you dont want a three dimensional effect (trust me, its not very good) dont bother with requiring it.
lcd/led confuses alot of people. both are actually lcd panels. the ones labeled lcd are backlit by a ccfl. the ones labeled as led are backlit by leds around the edge. cheaper screens using leds can make the image shift into a blue hue but other than that they are about the same. you can adjust out the hue as well.
at that price range i'd suggest going with a computer monitor instead of a television. you will get higher quality since a monitor doesnt require a tuner and all the extra features which cost money.
there are a few different types of lcd panels. TN, VA, e-IPS, IPS in order of cheapest to most expensive, and from worst color accuracy to best (generally speaking). TN panels are typically only good to view from a very direct angle before they start to "grey out" or "color warp" on you. laptop screens are normally TN.
personally i prefer higher budget IPS screens for the best picture but you could make do on a VA or e-IPS just fine. TN panels can be okay as well but i don't like the bad viewing angles on them.