$500 max blah blah... This is what I'd get... $100 over budget... better mobo, WAY better video card... better PSU that's semi modular... I like the case better but that's personal preference (it's my go to cheap case)... you could also look at the GTX 750ti at your price point... but getting an under-powered video card for dual monitor gaming isn't the best idea...
I really want to add in a CPU cooler cause AMD's stock one is a coaster, but I'm already pushing way past the budget... anyways, that's just my take...
you could also look at an APU based build taking the GPU out of the mix altogether (and definitely fit your budget), but it'll give you much more limited upgradability and I'm not sure how it'd perform on a dual monitor setup in games
Both cards are good, I personally would go with the Sapphire card I have had good experience with Sapphire cards. Also if you are going Sapphire try and find one with the Vapor-X cooler
$500 ---> buy a 2nd hand rig. You can score some real good deals that will wipe the floor performance wise of anything that is new for the same money. Old i7/i5 + gtx580 etc.
Okay so I think I've got an Idea on what to get. Something like this http://pcpartpicker.com/p/33O8i Should work I think. Thanks for your help guys really appreciate it.