BUT....check the first 2 out, its a freacking steal!http://
The first two have the following gpu in it which is just nice to put your desktop on your screen or view a video with,not good for gaming at all; "nvidia GeForce GT640 ".
You could have my option with an o.s. for that price and play games nice with that hd 7870.
You don't need hyper threading for games and the quadcore from my build would be good enough
I made some adjustments to prove my point,http://pcpartpicker.com/p/2VzrX
better cpu and windows included.
You would have to build it yourself for that price.
To see how that works,http://uk.hardware.info/reviews/2591/build-your-own-pc-2011-edition
You wouldn't even have the monitor for that price with the two first out off that link as far as i can see,