Couple of issues with that spec:
I'm not sure why you would "upgrade" to the v8, the Titan Fenrir is plenty good enough. If you need to spend the money - a
prolimatech megahalems is the best (unfortunately out of stock at the moment).
Two 4770s is indeed technically faster than a 4890. However, the problem is that if you get a decent 1080p+ monitor (which you should for this kind of money) you will run out of graphics memory when you turn up the settings. It also eliminates any possibility of upgrading the graphics in the future by adding a 2nd card. Going for a 4890 makes the most sense at the moment.
Also, I'm not sure why you would go for triple channel 3GB memory for a dual channel board. If you run two sticks in correct dual channel mode - you would only have 2GB of RAM. Get
this instead.
That samsung drive is pretty slow, get a
WB Black as mentioned before.