Mike, please fill me in on what way a lower frequency increases the size of components. Which components?
If you are switching at 100kHz, for example, and you take 1uS to switch, you are at 1% of your time switching. going to 0.5 or 0.1% of your time isn't really a big difference in the grand scheme. Changing from 10% down to 1% is definately a big deal.
Run a few numbers to size your parts according to 5uS, 1uS and 0.1uS and see what you get for costs and heat generation.
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