Wow i just read a review about that monitor and i loved it, ordering right now from Newegg ($275) as i didn't see any sale on the dell website. I'm still a bit worried that the response time is 8ms, but you say there is no ghosting on BF3 which is one of the games i most play. It also has the lowest input lag I've ever seen on a monitor 0.6 MS!!!
Here is the review that made me buy it: Dell U2312HM