New to Building PC's, was wondering if these were compatible?

[Ryanwag222]

I am a slightly wary of purchasing all the separate components of a computer and assembling them all myself, so I decided to do some sleuthing around on Newegg and find a reasonably priced gaming computer, and add some parts to it, to make the tinkering easier to handle for a non-tech savvy guy like myself, and this is what I came up with:
http://www.newegg.com/Product/Product.aspx?Item=N82E16883229285
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127608
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

Would these part's be:
A. Compatible
B. Cost effective
C. Good enough to run New graphically demanding games (Skyrim, BF3, ETC)
Any input is welcome, especially that which points me in the right direction for picking new parts that would work better together and be more cost effective, thanks for your time!

EDIT: Links

 

[Jake-]

So your buying a machine, taking out the PSU and graphics card to replace them with an equally as good graphics card, and a better PSU,

My advise, buy an identical AMD Radeon HD 6670 and crossfire.

See what Wattage PSU comes with the system, you may not have to upgrade.
AMD says that when crossfire-ing the AMD Radeon HD 6670 you need a 500w+ PSU.

If you plan the crossfire/SLI the 6670 and 560 Ti this will not work.

 

[Ryanwag222]

There were several customers complaining that the PSU on the machine was a flop, but it's a 500w PSU. Theoretically good enough for it, but again, with not knowing what can/will go wrong, it'd be safer for me to buy or find another PSU with a little more breathing room, correct?
The graphics card I was purchasing is much better than the 6670, is it not? If I do crossfire, which Radeon 6670 do I purhcase? When searching for the 6670, there are several different graphics cards from separate manufacturers with the same chipset; so does the manufacturer matter if I am planning on doing an SLI build? I really appreciate the help.

 

[Jake-]

You will defiantly need a new PSU, i would advise a 750w Bronze or better. (If using the crossfire, if not then the one you picked is perfect)

As Long as the Chipset is the same it does not matter what brand Graphics card you purchase here, Newegg.com - SAPPHIRE 100326DDR3L Radeon HD 6670 1GB 128-bit DDR3 PCI Express 2.1 x16 HDCP Ready Video Card Should Work Fine.

However, you could still go for the GTX 560 Ti If you wanted, and have the power of these two crossfired in one card, therefor in the future you can SLI.

The GTX 560 Ti is much more powerful than the 6670 and definatly more reliable than a crossfire. So if you have the money go for the GTX 560.

You picked good, you should really consider just building your own machine, alot cheaper and that way you get the specs you want

 

[Ryanwag222]

The price of the Actual Machine I was planning on getting can get marked down 100 bucks, effectively giving me a free copy of Windows 7, or else I would just put together my own machine. If I run into more money, I'll definitely purchase parts and assemble one, if so I'd be getting the AMD FX-4100 Zambezi 3.6GHz (3.8GHz Turbo) Socket AM3+ 95W Quad-Core Desktop Processor FD4100WMGUSBX http://www.newegg.com/Product/Product.aspx?Item=N82E16819103996&Tpk=amd fx-4100