Ouch, those are pretty big numbers. I was acking towards the Asus F2A85 aswell but will probably look at a very power efficient APU variant. Don't they come in 65W TDP's? Granted these tdp's are including a GPU.
I'm also leaning towards an external video card, due to the shared memory thing. Then again, it doesn't do a whole lot of heavy lifting so that shouldn't really be an issue.