Nice rig - as a lot have people have already stated; the only thing that needs upgrading to give you a beast of a setup is the GPU... To be honest though if you run the two older cards in SLI you will be golden for ARR...

Good places to check out where your GPU or CPU stand in the rankings (easy to read list with scores and prices) are;

GPU
Here

CPU
Here

Have fun with your new rig and see you in ARR ^^