Best $400 Gaming Rig On Craigslist?

I'm looking on Richmond's craiglist (http://richmond.craigslist.org/) I need to find the best gaming pc for $400 and under. I saw this one (http://richmond.craigslist.org/sys/3917701696.html) and I thought it looked good. But then I also found this one (I know it's $430, but I can go a little above $400, http://richmond.craigslist.org/sys/3939922195.html) I'm still looking and not sure if I can find the best gaming pc for $400 or less. Someone please help!

get the one with i7 in it.  Then later just get a new case and power supply and you can drop in a 7850 or a more powerful gpu and have a respectable gaming pc.

Or this http://pcpartpicker.com/p/1nenc

Would that be better than both of those?

But the second has a good video card?

The first link is down and the posted build would be better than the second. Maybe you can find a pc with a solid cpu, psu and 4 gb+ ram for around 300, sell the crappy GPU it comes with and get one of those http://uk.pcpartpicker.com/p/QBxs , or those http://uk.pcpartpicker.com/p/FjYH ,  comes with 2 free games and runs anything well at 1080p, 2x+ as good as a 650.