Third one is going to be far better than the other two on the vast majority of games i think. First one would probably be cheaper to upgrade though. They all look a bit pricey and the lack of details on the PSU's is disturbing though.
Personally, I would go for the first one, because that processor can be easily overclocked, and upgrading that graphics card would make a pretty good machine. I prefer intel over amd as well in terms of cpu's , but that is purely my preference.
The first one to me would be pretty decent, with some nice upgrade potential.
The second one is a little better for game play right off the bat, because of the graphics card, and of course the cheapest price.
The third one, as jmsellars said, will probably be better in games than both of them as is.
If you don't plan to upgrade any time soon, go for number 3, other wise number 1.