I just checked the Lenovo website and the prices look slightly lower than 6-8 months ago, but probably still higher than you want. Nevertheless, the good one is the W510, here:
http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPortal/en_US/speci...filter=Usage_1
The screen you'd want is this:
15.6" FHD Display (95% Gamut, 270nit) with LED Backlight
Currently it's an extra $250 for the screen. Note that you can also get a Pantone Color sensor (I believe it's built in) for another $70. The next model up is even wilder - it offers a built-in Wacom tablet and dual screens (I'm not joking!) as well! I don't know of anyone else that offers this much in a laptop for photographers.
Edit: I noticed Lenovo is also offering this screen in the T510 now, which is a few hundred dollars less - I don't think they did before. So it's possible to get a laptop with a nice screen for around $1300. This all assumes you don't mind a larger 15.6" laptop. This is likely the best screen you can get for anywhere around this price, but that MacBook Air sure does look interesting!