Microsoft claims that sleeping overnight saves more power than a hard boot the next day. I haven't tested this, but I do like my PC awakening to a ready state in seconds rather than minutes. If anyone owns a kill-a-watt, feel free to share your results.
I haven't checked boot up, but sleep for me uses .7 watts. It surfs at about 15 watts. Boot up is pretty fast, but somewhat intensive, but it's a little hard to believe that could compensate for a constant drain of .7 watts. I'll have to do a time study and see one of these days. The trouble is my killawatt ends up in a dark corner in a mass of cords, so it's a little hard to read. I'm going to have a good clean up after I get an enclosure for the hard drive. It's definitely an incidental cost if it's plugged in all the time. I guess I would think about it if I was carrying it and I could stretch a charge into 2 days or something. I don't think that could happen with this one. That battery doesn't look very big to me. I did take it out. Best not to lose capacity in case I have a power failure. I'm probably only going to save 3 or 4 dollars a month, but I like using the least amount of power possible, within reason.