Almost finished my build copletely

I'm only left with the gpu now.

My choice is :

a) 3 GB MSI 280x for $230
or
b) 4 GB MSI 380 for $275

What should I do ?

:D

r9 290 for about $260 - http://pcpartpicker.com/part/sapphire-video-card-1003623l

Cheapest I can get a 290 in my country is $305. Is it really worth $75 over a 280x ?

yes