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I recommend doing it the MB way, that's good enough for me. Drain the radiator out of the plug (low spot in the radiator) and the block drain, which I agree isn't as thorough as POSSIBLE, but pretty good. I'd discourage running water through it, just refill using 50:50 premix.
If you are keeping up on the regular maintenance, the coolant you're replacing shouldn't be in THAT bad shape that you need to be concerned with removing all traces of the old stuff. If you bought it used and it's real old and junky coolant, then I can understand wanting to do "more" to flush out the old stuff. But with a well cared for car, you shouldn't need to worry about it (but I know some of you will!!).
Gilly
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