Re: Graphics Card/PSU
You should be fine. 10W won't kill it. Just don't run your comp for a long period of time, oh, say more than a few hours at a time. Frequently running a psu near 90% shortens its life. But you shouldn't run that close to the psu limit. You should be fine.
Macbook Pro and Logitech z5500s. All you really need.