This is the one I have, you can get them with a glass screen if that is something you like, I personally prefer matte because I game with my lights on.
http://www.ebay.com/itm/PERFECT-PIXELS-Matte-QNIX-QX2710-LED-27-LED-Monitor-2560x1440-for-USA-/321205794938?pt=Computer_Monitors&hash=item4ac95b787a
This site will tell you everything you need to know about overclocking etc...
http://www.overclock.net/t/1384767/official-the-korean-pls-monitor-club-qnix-x-star Just remember there are some drawbacks to the korean monitors but the savings in my opinion are well worth it. You can only use a dual link DVI cable so no connecting consoles to the monitor, make sure your GPU supports dual link DVI (A titan will work no problem). I recommend the pixel perfect monitors for peace of mind but many people claim that they have no dead or stuck pixels on the regular ones. It's normal for some monitors to come with up to 5 dead pixels so you can't return the monitor for that reason and some have back light bleed issues which can be fixed if you are up to the task.
I know this probably sounds dissuading but better for you to know up front what might happen, but if you look at reviews a majority of the time the monitors come in fine working condition, mine works just fine with very minor backlight bleed which you can only see when your watching something where the screen is completely black. I would buy mine over again if I had the chance, for the price it's a beautiful screen and the quality of it is on par to the apple thunderbolt screen I use at work. Just look around at some reviews and what not and decide for yourself.