The Corsair "CX" is not a good PSU for a gamer, since it was made with inferior Samxon capacitors that can't take the heat and quickly degrade. A 550W XFX or other Seasonic-built PSU, or a Rosewill Capstone would be good choices.
Sapphire makes a wide variety of graphics cards with 2GB of RAM; more information is needed. You should be able to fit a R9 270X or GTX760 into your budget.