So my question was, can I buy one of these without building it? Can I buy the complete one straight away for $625?
No. You can not the business that builds the computer needs to make a profit.
dude building a computer is easy, if you ever played with legos thats it, the hard part is picking out the parts that are good and compatible and we'll do that for you, sereously, a monkey can put one together
yah u can buy a computer right away for that much but it wont be as good as a personally built one
I could biuld one for you if you want but I agree with the others its really easy to build your own, you should give it a shot its tons of fun. http://www.averetthardware.com/
I'm in the same boat but I've managed to build a COMPLETE PC meaning OS and Monitor for around that price.
http://secure.newegg.com/WishList/PublicWishDetail.aspx?WishListNumber=29087668 $639
You may be able to bargain shop or buy locally some components and get this thing down to around $500, who knows. If you can then get the 6670 HD to throw in there and you've got a decent gaming rig that has great upgrade paths.
By the way props to The Tek for putting together most of this build.
edit: If you're looking for a pre-built gaming PC then check out iBUYPOWER or CyberPowerPC. However the thing I hate about these is there is always one or two components that really suck and often these things have terrible PSUs and janky graphics cards that you will spend several hundred having to upgrade anyways.
Are you sure you want to go with Windows 8? Personally I would stick with 7 and wait and see with 8. As always, just my opinion.