I recently acquired the BenQ XL2420T 144hz rev2. This monitor is amazing and if you're mainly playing FPS, you shouldn't doubt about getting it. The only downside is that it costs €380 (in the US it's way cheaper). Don't believe me blindly, here's a link to Linus' video about it (this guy KNOWS his stuff!): http://www.youtube.com/watch?v=I6wIMaYjklE

In case you're sold: http://www.amazon.com/BenQ-XL2420TE-Performance-24-Inch-Professional/dp/B00D7IG556/ref=sr_1_1?ie=UTF8&qid=1388145571&sr=8-1&keywords=XL2420