I am in the same boat, trying to buy a 55-60 inch tv. So I've done some research on AVS Forums, then headed out to the store.
Saw mostly all the display models, then I saw the Samsung UN60D7000. Wow. Almost no frame, LED last longer than plasma and lcd. Emits less heat, less energy spent.
You had to have seen this model right? Every other TV I looked at after, didn't have anything really new about it. This one has the 3D, with newer, lighter glasses.
Also it converts any 2d into 3d, but remember (3D) is not the main reason to buy it. I currently have a Sony and Sammy Plasma and they do the job, I just wanted to upgrade to something new that looks fresh or has the wow factor.
My friend that was with me despised the look of this TV, didn't understand why, but it is really down to your opinion.
Remember one thing, The TVs at the store are not calibrated at all, and usually use a coax crap cable. They are on the brightest setting possible usually.
Each company has their own contrast ratio measurements, so don't compare. Refresh Rate is vital for video game players/Sports games viewers, Higher the better, but for plasma/led/lcd they are individual meanings so don't compare them.
They do make a higher end model, the UN60D8000, but out of the range you spoke of and same here for me.
Good Luck and hoped to of help you a lil' bit. I am not a pro but am an a$$hole when it comes to the best tech.