Are you sure that's going to work? I don't think you'll be able to take full advantage of your graphics hardware that way. (Last I checked, Virtualbox and friends refused to allocate more than 256MB of VRAM... so I could play Duck Game and no more.)
I was thinking it'd be fun to benchmark an application running on Windows vs. that same application running on Wine running in the Ubuntu Userspace in Windows. I'd have to guess it'd be at least a few times slower.