If you actually care about gaming and value your money at all, you would do a few hours of solid research and learn to build your own.
Not a single computer you've linked yet could play skyrim at high, much less highest, settings.
I just spent $700 upgrading my pc a few weeks back up to something that would probably break around 2k at one of those retail locations. It's just not worth it unless all you're doing is office type work.