I have a Viewsonic Vp171b, 8ms and DVI. Very nice monitor, haven't had any issues at all with gaming (even with Grid Wars, which I am currently addicted to).
Basically the thing to remember is you want the lowest response time possible. 8ms is very good, you can get ones that are faster but I highly doubt you'll notice a difference.
After that, the only real consideration is to check customer reviews. If it looks favorable, then you'll be good to go. Keep in mind also that companies carry defective/dead pixel warranties, but you usually have to meet a requirement before they will agree to replace a monitor. Normally it's 4 or more dead pixels before a company will do anything, although if you are persistent you could probably make any company bend. However, that issue won't appear until you've gotten your monitor. Really it's just a crap shoot, but it's a good idea to check the manufacturer's websites prior to purchase.
Also, Xerox LCDs (at least the one my gf has) have a protective layer on them, meaning that the LCD screen itself is protected by a thin plastic barrier. This is especially important because LCDs WILL become damaged if someone touches them. Not from the slightest touch, but it is still something to consider. If you had, say, little brothers or sisters/kids/nieces/nephews/etc or anyone else who might be in the habit of touching the monitor, it would be in your best interest to consider a Xerox monitor with a shield.
Obviously it doesn't matter if you are a nerd living in an apartment by yourself (like me).
Hope this helps.