What monitor to choose? Korean 1440p

[RedFury77]

I'm about ready to pull the trigger on one of these Korean 1440p 27" monitors from ebay.  There are just a couple of things that I don't know about that I'm hoping someone might be able to clarify for me.

 

First off.  No Display port?  Is this an issue?  Most of these monitors have just a DVI-D connection and that is it.  One of the monitors I'm looking at has every connection, will having this extra hardware then possible introduce input lag?

Then you have the PLS vs AH-IPS option.  Seems that the cheapest option is a PLS but is also commonly able to overclock well.  While the AH-IPS screens are typically behind glass with some kind of glare reduction coating, it seems like the glass would be bad for reflections right?

Last is brightness levels.  Seems like the most common Qnix has the lowest rating, 300cd/m, while the AH-ips screens are toting 440cd/m.  To confuse me even more the catleap is inbetween at 380cd/m.

 

 

OK so here are the monitors:

Qnix QX270 same as X-STAR DP2710 is going for $279. or $339 for the Perfect Pixel option.  I was planning on going with the Perfect pixel monitor but the standard one is on sale right now and man, $60?  IDK if its worth it though.  http://www.ebay.com/itm/330932578190?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

The AH-IPS monitor is the YAMAKASI DS270 IPS SE going for the same $339 for Perfect Pixel.   http://www.ebay.com/itm/141014647239?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

I was also looking at the YAMAKASI CATLEAP Q270  $329.00.  I don't know about this one.  I just did a little research and it may be a glossy screen and just doesn't have any great reviews out there.  Here it is anyway:  http://www.ebay.com/itm/140723272177?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

So basically I'm leaning towards the YAMAKASI DS270.  It looks sexy and has better brightness and response time when compared to the x-star.  But I just don't know about the screens or overclocking ability. 

Any suggestions?