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I recently replaced a 140W 20" CRT with a 14W 20" Acer LED ($100) and since that monitor is used 16hrs a day at a 15c KWhr rate, the LED pays for itself after a year or so. The CRT though just won't go and die yet. The CRT still looks way better for square TV/video, but far worse for everything else.
My oldish 24" LCD though is closer to 80W and is toasty to sit in front of. Most plain LCDs are not as frugal as they could be, typically 60W and up for 24" and bigger screens. Some of those 27" and bigger Hanspree and HP models are well over a 100W.
My next 24" will also be a 1920x1200 LCD from Lenova that uses a half power CC tube at 35W. Wonder why more CC tubes don't use that design since it compares well with LED on power.
Still LED back lighting really seems to be smacking LCDs now on power and the price difference is becoming minimal and could easily cover itself in short order. Also LED makes for much slimmer, lighter panels (and woblier too).
Also on ATX power supplies, most PCs use <80% efficient PSUs and the power factor is usually bad too. Compare the VA value against the Wattage value, VA is often 20% higher. Since most budget PCs can use a motherboard with built in graphics, they should be able to run on 60W or so esp if a 2.5" HD is used. That means the 300W PSU could easily be replaced by a micro PSU that fits entirely in the 24pin molex connector. These fanless Minibox supplies can deliver from 60W-150W saving space, noise and power and are >95% efficient. They do use an external 12V DC adapter though. Using one though will limit expansion options.
For most of my PCs, I also switched to refurbished 2.5" HDs drives leaving the 3.5" HDs only for mass storage used only when needed. Saves power, space and noise. Microcenter often has these for $15-$20 at 40-60GB size.