Best gaming 27/30" monitor?

Maybe this
http://www.ebay.com/itm/ACHIEVA-Shimian-QH270-IPSB-Quad-HD-2560x1440-16-9-27-Monitor-Tempered-Glass-/320857320377

Have you looked at the Samsung S27A850D? I have no immediate experience with it, but I've heard it is great. My parents have a HP ZR2740w that is excellent as well. From the little bit of gaming I did on it, I found no noticeable ghosting or lag.

Apple Cinema Display-Glass, low input lag.

Samsung S27A850D (Semi-glossy/lightest matte coating, it's much lighter than what all 24-30" matte IPS panels use) it has 13.6ms of input lag. IPS panels with extra inputs+scalers all have a similar delay, the Samsung models are a bit faster.

Samsung S27B970D-Glass like the ACD, it will have the same input lag as the 850D, but you will not find a display with better colours

Achieva Shimian/Potalian/CrossOver/Yamkasi/PC Bank from ebay, the dual-link dvi only models have the low input lag like the ACD but lack an OSD so you can't change any colour settings.

120hz.net has the over clockable (up to 120hz) catleaps and overlord computers will have their own allegedly.
Edited by MenacingTuba - 8/20/12 at 8:11pm

Interested in this thread.

It's going to be nearly impossible to fit all of your criteria with so few options on the market ATM. Betwixt the two 1440p options, which are Ultrasharps/Apple Cinema, I vote for the (last gen 30")Cinema simply because it has more viable connections(catleaps are just a crapshoot for build quality). Although, with release of the new gen Ultrasharps, I would wait until release until you make any decisions.
Edited by Blindrage606 - 8/20/12 at 8:23pm

I can personally vouch for the ZR30w. 

Has some of the lowest input lag for 30-inchers.

Excellent IPS display. 

All matte 24-30" IPS use the same grainy anti-glare coating. All of the 30" displays use the same panel and have nearly identical performance. A 3011 will have slightly better colour presets than a 3008, other wise they are essentially the same. High res IPS with scalers & extra inputs always have around 17-24ms in terms of input lag when measured accurately with an oscilloscope, which currently only PRAD.de does.

The dual-link DVI only 1440p models lack a scaler and have lower input lag than the rest. There are 30" Korean displays but they suck, basically you would be spending 900$ on an inferior, warranty-less 3008 with a different bezel. The ZR30w is just a 3008 w/o input lag or a menu, you wouldn't be upgrading in terms of image quality.

If you actually want to upgrade in terms of image quality you can't buy a 30" display.

The Korean models all basically have identical performance, except the CrossOver's which have nice bezels and stands. The main exception is the CrossOver 2720MDP which has a scaler & extra inputs and slightly faster pixel response times (less ghosting) according to playerwares who has reviewed pretty much every Korean model. I have a 2720MDP as well as a Samsung S27850D and they tie in terms of input lag (13.6ms) which puts it ahead the pack.

If you are truly after the lowest input lag then you have to buy a dual-link dvi only model, but you can only change the brightness on them. A 2720MDP, 850D and 970D should feel noticeably snappier than your 3008.

The dust getting trapped under the glass (tempered glass) only applies to models which are glossy and then have glass placed over top of them as far as I know. There are a few Korean models with tempered glass, I think the horror stories started circulating in 2011 with Hazro's 27" 1440p tempered glass models. The 970D just has glass.
Edited by MenacingTuba - 8/20/12 at 8:46pm