The cheaper Dell monitors are just "Alright". I'd actual prefer many other brands over them when it comes to quality/performance. But if your looking in the 300+ range for Dell monitors, like say a 2xxx horizontal resolution, then they are pretty solid. I'm extremely critical of Dell as their low-mid range stuff seems to me some of the worst junk on the market, but I have to hand it to some of their higher end stuff.
I currently own a lowly Dell ST2420L. It was a gift a year ago from a co-worker/contract who I had worked with. Was brand new as a Christmas present actually, sort of a bonus
. Well... its got none of the bells and whistles of the monitors your talking about, but its be "OK"... Its big, its 1920x1080, has HDMI and DVI and VGA. Has a very modest 5ms response rate, is an TN panel not IPS... Its nothing to write home about. For the 199.99 that Dell is asking, I would have never purchased it myself. I do have a very distinct dead pixel on the screen and believe me I tried everything include JScreen Fix. But for the low low price of free, I'm happy enough
If I were to buy a new monitor today (also gaming). I'd prefer nothing larger than a 24" monitor. If you've been used to using something bigger than more power to you. The issue is that if you don't sit far enough away from your monitor, your going to see imperfections and it actually makes the gaming experience very crappy. The other thing that bothers me when people are buying "Gaming" screens is they go for the largest thing possible without paying ANY attention to the refresh rates. You want a monitor that will do no less than 75hz HORIZONTAL. If you can find detailed specs about a monitor (and they are getting harder to find, for some reason), make sure you read the "Vertical/Horizontal" refresh rates. Find a detailed specs page or manual if you have to, most places only want to list the basics and all of the useless fake features of a monitor. Like mine lists "8,000,000:1 Contrast Ratio!"....... ummm ya right, estimated by whom?
Reason being is that I noticed you've got an I7-2600k, so I'm assuming you have a video card to match that price point. If you can pump out more than 60fps in your games, you want to be able to see that, otherwise you wasted your money on a video card capable of pushing today's games out past 60fps.
I also attempt to cut out ALL of the extra BS in monitors. If you have the choice between one with built in speakers or a webcam and not, usually take the one without (obviously do the research first). Generally speaking they had to cut costs/quality from the actual display to add those features. I buy a monitor to be a monitor, not a 4 port USB hub, microphone jack, webcam or speakers.
Unfortunately which brand to tell you to go for... That I can't do. I never dabble with those higher end monitors, I've never seen a need to spend 500 bucks on a computer monitor. The 200-250 is about where I stop. I've liked a good number of the Asus ones I've purchased, but alas they are all LED TN panels. Then again, if your gaming and not worried about video editing, you may be fine with a higher quality, LED back-lit, Non-IPS panel.
One question I guess... is 3-D something your concerned or interested about?