Before I start, it would be nice to know what your budget is, so I might be able to find some in your price range, but I'll do the best I can:
The CF390 is nice, but doesn't have as high a response time as your other pick, which means it might not be as good for gaming as, say, a home theater. Also, it has an extremely curved screen on a relatively small monitor, so unless you're a big fan of the curved gaming experience and know exactly what you're in for, you may want to stay away from something as dramatic as that. As for the other monitor, I have to say I like it a lot more. Because you say that you will be playing MMOs and (occasionally) shooters, I feel that this one, with a high refresh rate, might be the one for you. Although if you picked your first monitor because of the curved feature, then this one, with it's flat screen, might not be as good for your purposes. If you could give me the PC specs, I might be able to help you a little bit more, as I could see what resolution you might be playing at. I hope this helps!