Nice setup you got, Rudemeister. I wonder if you could run a Xen hypervisor and your Win 7 as a VM with VGA passthrough?
By coincidence I just saw one of your older posts asking about OpenBox (you mean VirtualBox?), KVM and Xen.
Well, I was in the same boat a year ago and decided to go with Xen since I needed full hardware acceleration for my graphics card under a Windows 7 VM. Xen was the first to offer this, and still seems to be years ahead.
What this Xen setup does for me is that I got rid of dual-boot. Windows runs in a VM but anyone using it would be hard pressed to find any (performance) difference to a native installation.
Your PC should be a good candidate for that. Except perhaps the Nvidia graphics card - AMD has better support for both Xen hypervisor and for VGA passthrough to Windows. You will probably need a second graphics card for it anyway.
So, if your hardware meets the specs and you are ready to spend some time to get Xen and Windows with passthrough running, you may want to try my how-to here: http://forums.linuxmint.com/viewtopic.php?f=42&t=112013
You could easily turn your PC into a workstation for 2 people working simultaneously on it. Or run a full-fledged Windows VM for gaming on a Linux/Xen host.