Consolidating network devices to save on power bills

"You do realize that even if you save 10W of power year round, that only adds up to around $8.70 (10W * 24 * 365 = 87KWh, around 10¢/KWh = $8.70), so you're looking at a payback period longer than the expected lifespan of the device?

Also, once you consider the environmental impact of manufacturing that new device (and disposing of your old devices), I doubt it'd be a net environmental positive.

You may want to obtain a Kill-o-Watt (there are other models too) to find out where you can actually save some power. I'd start with the cable TV set-top box (if any) to find a phantom load, I've seen ones that use >100W when ""off""."