AMD A10-5800k or Phenom II x4 955

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What about this: ASRock FM2A85X http://www.newegg.com/Product/Product.aspx?Item=N82E16813157339 and the A10 5800k http://www.newegg.com/Product/Product.aspx?Item=N82E16819113280.

I was searching comparison between the Phenom II x4 955 and the A10 5800k, and the A10 is not that far from the Phenom II 955.
It doubles the L2 cache of the Phenom II, but lacks the 6 MB L3 of the phenom.
It has a higher stock clock (3.8 Ghz and 4.2 Turbo Boost)
Unlocked (Easy overclock)
TDP 100 watts (Phenom II x4 125 watts)
I have the Hyper 212+ (So I'll not be using the cheap cooler of the A10)

There's a lot of videos showing the performance of the A10 IGP and it looks pretty good. I was thinking getting a 7750 or 7770 with the Phenom II, but my processor it's getting old like my motherboard.

I don't need to play games at 1080p at ultra, just 720p with medium details at acceptable frame rates. (Right now I'm playing COD MW3 with the HD4200 IGP of my motherboard, all low and still runs awful 10 to 30 FPS, so I think I'll get better performance with the A10)

I have a 2 x Kingston HyperX Blu 1333 Mhz 4 GB (So I don't know if I'll get good performance)
 
While the A10 APUs are more modern than the "old" Phenom IIs, you won't see any improvement in gaming with that processor over your 955. In fact, you may even see a tiny downgrade in some games. And the Phenom II Black Editions are just as 'easy' to overclock as the APU. The niche for the APUs is for low end gaming rigs without the need for an expensive discrete card. I would stick to what you have now and getting the card discussed.

You seem to have the urge to do a new build, however. If you end up talking yourself into building a new gaming rig from the ground up, I would advise against an APU unless you want to avoid buying a discrete card. In that case, the APU would be a good choice. But then, that board would be overkill.
 
But you mean no improvement over my IGP HD 4200 or the possible 7750-7770?

I don't have to do another one, but I'm looking good upgrades because my system sucks at gaming with that HD 4200, 10 to 20 FPS in MW3 all low is annoying (I build this rig before knowing anything useful about video cards or processors, so I didn't know how good that processor and IGP was).

If I add a 7770, I'll have to add a PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16814102993 Sapphire 7770
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151093 Seasonic M12II 520 watts (I can change it for a Seasonic 430 watts, I think is more than enough)

But the question is, will this configuration last?

I just want to know if It's necessary to upgrade now (I don't play games to often with the HD 4200 , but for web browsing, homework and multimedia is good) or wait to get a more capable system with a good GPU and CPU and brand new hardware in 2013 with more budget and more knowledge.
 
I mean no improvement over either one when compared to the PhII X4 955BE.

Almost any discrete card will be a night and day improvement over the integrated video. Heck, a slow dual core Athlon I and the 7770 will be a major improvement over that integrated video and any CPU. Remember; in gaming, framerate is first and foremost about the graphic card.

The PSU you have now ( http://www.pcel.com/Pixxo--60134 ) has a 36A +12V rail. Basically, it is an over-rated 350-400W PSU. Plenty for the HD 7770. It has a single PCIe power cable, so it was intended for use with mid-range cards. It will be fine for that card.

If it were me, I would simply add the new card and see how it performs. Trust me; you'll like the improvement. You'll think you just upgraded your processor too because now it can use its full capabilities with the new card. Then if you get the urge in the future, you already have a decent card to build around. The HD 7770 will perform beautifully at 720P and beyond. I once had its earlier cousin, the HD 5770 paired with a dual core E6700 at 1680x1050. It was able to run max/near max settings in most games at that resolution.

Yeah, a good GPU beats any IGP but, should I wait to get a better CPU and Mobo (I like AMD CPU's because they're cheap, Intel is great but it's really expensive for a CPU) and possibly a powerful GPU (Also a quality PSU and a nice quiet case)
I mean start fresh with new hardware (I'll save money to upgrade all once) and if something gets outdated I'll just change it.