GPU and Power supply?

[Alazzer]

My system is a:
Corsair Vengeance 70 case
Asus Maximus Hero 7 Motherboard
i5 4670k 3.4 Processor
Cooler Master RS-650-PCAR-E3 (current power supply with or after GPU) non module
1333 samsung x 4 @ 2gb (current ram Last to be updated maybe even a SSD before)
Seagate Barricude 2tb
XFX HD 5770 ATI card (current card next to be replaced)

R9 280X Is what I was thinking on I wanted to know if this was the right card to buy now and What brands I should try, even if it's not a 280x. But also what power supply I would need for my build plus a 2 card crossfire R9 280X or even what 290's and 290X's require. Any other information would be great.

From Canada

 

[iamlegend]

R9 280X is a good choice (I own 7970 rebranded 280X).
Power supply for crossfire is 750W (i own 600W and I also plan to get 750W for crossfire.)

You can max BF4 and COD ghost.
Cheers my friend!