hmm. are you going to be putting a graphics card with that? because if the processor is at 45 W, not too different from the Q9400S I have, you'll be able to run on about 100W using a pico psu. Which is going to up your points/day/watt. Especially if you're not putting in an optical drive.
edit: I'm a seti nutter, so the graphics cards always kill the wattage efficiency..., but I did have that quad on a 90W pico psu for a bit, minus the graphics.