I't probably could, but I would not buy it. The reason you need dual core is for applications like XBMC. They have databases etc, and the bigger your library gets, the more grunt your cpu wil need.
That's a very good point. I guess R850 for the extra core + wireless n isn't exactly steep anyway. I'm also not sure about the optical drive. The slot-load slim Sony I found is very cheap in the UK, so that's an option, but it probably isn't region free in which case it's pointless.