Is the AMD Dual Graphics worth it?

Im building my first computer and was wondering whether to go with

 

AMD A10-5800k Trinity 3.8GHZ and maybe the ASRock FM2A85X Extreme6 FM2 AMD A85X (Hudson D4) HDMI SATA 6Gb/s USB 3.0 ATX AMD Motherboard... AND add a dual graphics campatable video card to run dual graphics (like a Radeon HD 6750 1GB card... If i read right that is the best that is compatable for dual graphics)

or would I be better off to forget the Dual Graphics thing and just go with a something like a AMD FX-4170 Zambezi 4.2GHz Quad core or AMD FX-6200 Zambezi 3.8GHz 6 core... AND get another video card?

I would mainly be using this system for design purposes (running CS6 but not much video editing) and gamming.  I’m running on a budget of no more than $400 for the Processor, Motherboard, and video card... but I want to stay closer to $300.

Any help is good thanks.

 

If you want to edit, NVidia cards will be better. And those two other CPUs you mentioned are last gen and theres little to none reason to get them anymore. Newer Piledriver CPUs outclass them anyway.