You don't need the DOMINATOR series or 2133MHz in RAM. Complete waste of money. The performance increase is not worth it.
Completely agree, I would never pay money for the Dominator Platinum. It's a 3X premium for nothing gained. Especially with RAM prices as volatile as they are right now.
so i want to know if all these are good choice and what gpu can i use?
Depends how much you want to spend. I look at it this way:
<= $150: Radeon HD 7770
>= $200: NVIDIA Geforce GTX 650TI BOOST
Between $200 - $250: Radeon HD 7870 XT
$250 - $300: Radeon HD 7950
$300 - $400: NVIDIA Geforce GTX 670
$400+: Radeon HD 7970 GHz Edition