I ran into this this morning. Displayport -> Dual-link DVI (or HDMI) requires an active converter which is about $100-200. I was trying to hook my laptop up to it and my laptop can only do single-link DVI or displayport.
Joshsquall, I have been gaming on this monitor a fair bit and it seems fine. I'm not super picky about things so maybe someone with more experience should comment, but from my perspective, games look great (Skyrim in particular) and Diablo 3 has been fine, and I played a bit of some older FPS games and they worked fine. I don't see any noticeable ghosting or other gaming display problems. I will say that it doesn't feel super, super fluid to me, but it's also not so slow that it's a problem, and the colors and clarity of the screen are fantastic.
I have no experience with the other brands, but the Shimian QH270 is pretty cheaply built with a really lousy stand and the external appearance just looks cheap. It has standard wall mount VESA holes though, and the panel/screen looks awesome, but the bezel is sort of glossy but warped a bit and I'm generally unimpressed with the look of the actual plastic of the monitor. But the screen is wonderful and that's what I wanted. Somewhere on here there's a list with general guidance - like second or third page in.