I'll just have my usual pop at Windows - I hate it, I never want to have to buy it again, and I can't wait for the day my laptop pushes me to install Linux on it as well.
Without the need for games, I see no reason to fork out for Win 7 - Ubuntu or OpenSuse is just a download away.
This is the best reason for me:
As for the graphics card - the TDP of the nVidia 260 card horrified me at 182W!! I thought it might be a candidate to replace my 8800 GS, but I'll pass on that. I never saw the need to overclock my Q6600 (I got the one that does it well) - the extra cores mean performance is very consistent. I will say that editing HD video is the first time I've even had cause to want moar powah!
The modern integrated graphics cards do HD pretty well, and use a tiny fraction of that wattage. As that would necessitate gutting his PC, how about a nice, latest generation, low spec ATI card? They're noted for their video performance and are parsimonious on the power. The PSU issue goes away too.