I'll only mention ones that I have experience in, but as you know you can spend a lot of money on these things. You've not indicated what size you're thinking of, but I believe for your budget you can pick up a BenQ 24". I've been using one (though not as my main image editing monitor) for a year or so and it's fantastic. The only reason I'm not using it 100% is that I'm a Mac user with a 24" iMac. I'd put the BenQ up against it any time as far as image quality goes.
There are few threads knocking around the camel than mention the Benq - e.g.
Dell 24" monitor
Widescreen vs regular LCD
GOOD LCD MONITOR.....
but feel free to continue your discussion here. Always useful to get a 'state of play' discussion on what's out there in LCD land - it changes so quickly

.