Budget gaming pc

So after christmas I ended getting money and have been looking to build a pc or buy a pre built for the same price or lower. I was looking on other posts and found this one. http://pcpartpicker.com/user/Triqkster/saved/pJZ2FT turns out it ended up costing 456 atm if you buy the motherboard from amazon and rest from where it says. But if i can go higher by just a little bit then help me. Note this doesnt come with OS, mouse, KB. I also need to connect to wifi, but dont know anything about it to choose one. My budget would be around 480-500. 

for a gaming build i'd go for more than 4gigs of ram....or at least dual channel ram

something like this is might work

http://www.newegg.com/Product/ComboBundleDetails.aspx?ItemList=Combo.1808704

http://www.newegg.com/Product/ComboBundleDetails.aspx?ItemList=Combo.1752931

http://www.newegg.com/Product/ComboBundleDetails.aspx?ItemList=Combo.1758086

as for the rest theres still promos going on i think