Good color reproduction, that means ISP and not TN. TN means Twisted nematic. This type of monitor usually gives you a bit ebtter refresh speeds but have a narrow viewing angle. In-plane switching will cost more but will have better color reproduction.
Do you want 1080p or 2K (1,920x1,080 vs 2,560x1,440-pixel resolutions)? 2K typically costs more but looks really good.
How many inputs do you need? Are you still ising VGA or are you using DVI or HDMI. Typically unless the monitor has built in speakers you'll only have DVI or VGA and not HDMI. The only real difference between DVI and HDMI is that HDMI supports audio.
I'd go with a Dell UltraSharp U2713HM. You'll be looking at around $550.
If you don't need 2K then you'll save around $100-150. Then Dell, Asus, Viewsonic and Samsung make decent monitors in the $175-300 range.
I have a Monoprice IPS-ZERO-G Slim Monitor. It's not for everyone though. It's a 27" IPS 2K monitor. I got it on sale with Credit Card points so it was a great buy. There are a bunch of other off-brand Korean monitors that have weird names on ebay as well. These use rejected screen from other companies. Most notably Apple and Dell. Apple and Dell get A++ screens while they reject A and A-. So companies turn these 'rejects' into monitors for the home(korean) market. They typically have fewer features but you can get some really nice ($1000) monitors for very little cash ($300-400).
If I was going to buy a 1080p monitor I'd probably get a Asus or Viewsonic. They are easier to find here. For some erason Samsung isn't as dominate and it used to be. I have a bunch of their monitors.
