[b0unce. [?]]

problem with the ones you listed is they don't come with video cards lol. you're never going to run anything with onboard graphics besides flash games or minesweeper.
also bb/fs always racks up their prices on premade desktops. pos towers they sell for $500 would probably cost you $200 to build yourself. i'm sure they increase the price probably cause of labor + mark up at fs. if you're budget is under $800 (assuming you dont need to buy a monitor, keyboard, mouse and other accessories), you can build a pretty monster computer that would run most of the games you're interested in.
most of the computers at fs and bb usually are tailored towards the everyday email checking-web browsing-facebooking-youtubing people who don't require a lot out of their computer.

lol i just realized while browsing through bb's website, they have a 'gaming section' under their desktop computers area. maybe you'll find something there you like.