Best display for Retina MacBook Pro?

I'm looking for a good display to connect with my Retina MacBook Pro. I can't invest $1000 in a Cinema display, so i'm looking for something with comparable quality for cheaper. If possible i'd like to stick with Dell or HP, as my company gets volume discounts, and thus making it more economical.

PCMag has a list of good monitors, but they are a bit out of my price range, i'm looking to spend max $300. I heard that the Dell U2412M was a decent monitor at a great price, though most reviews seem dated.

Anyways if anyone has any suggestions or recommendations, i'd be happy to hear!