that is a pretty solid gaming rig you have. the only things i would consider upgrading are the gpu's (dual 5870's!), add some more ram, and possibly an ssd or two if you really want to take it to the limit. otherwise i think you are running just fine.
Well. From what I can see here, your CPU/Motherboard is okay, but about your GPU, you might want to look at some DX11 GPUs after NVIDIA/ATI start to produce their cards again in Q1/2010. GTX300 and 5*** will be back on the market again. That should last you for two years or so (Depending on what you're doing, for gaming, that's right)
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