I've used a pretty wide variety of centrifical pumps over the years and I've yet to see one fail pre-maturely from powercycling (infact I've only had one pump fail from motor failure, and that one was on 24/7)
I have test pumps that get power cycled very frequently at times, none have let me down.
I've never had a pump fail from motor failure in my pc water cooling, and they get power cycled every day, including my iwaki pump, I'ts not something I worry about.
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feel free to icq/msn me, I'm always willing to toss around ideas.
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