You would probably end up with a TN panel because that is what dominates the market and cheap.
The technology is very mature by now and it doesn't matter which company you go for just look for key specs.
Resolution: Bigger is better, manufacturers are pushing towards 1920x1080 as standard now
Response time: anything 6ms or faster is good for gaming
Color gamut: Shown as % of NTSC. Not many manufacturers advertise this because TN panels have dreadful color compared to IPS panels. An average TN panel have 72% of NTSC while a IPS would have an average of 115% of NTSC.
Refresh rate: 60hz is standard for LCD but 120hz monitors have been comming out for the past several months. They are better than 60hz monitors all around but more expensive. Probably more expensive than they are worth because you can't really notice the difference anyway. 60hz monitors provides really fliuid motion already.
Contrast: Means absolutely nothing. TN panels are all 1000:1. Dynamic contrast is horrible. It dims the entire backlight of your monitor to produce blacker blacks but turning off the backlight ruins color as well and dims your whites. You will just notice your screen go dark in video games and flicker in brightness if you are scrolling very fast in a first person game. Always use static, who even needs blacker blacks...