I must say that I voted for 1M but I agree now by reading this that it's too much coins required to run a node
I would like to change my vote for a number between 200k and 350k coins.
Also, it would be the best if we could get the opinions of the dev and ccr too.
i also voted for 1mill, but am having 2nd thoughts

i like the notion that they could be a serious investment, but unfortunately without any idea of what the market value might be like in 3 months, it's hard to usefully project a value.
i've changed my mind to 350k - 400k:)
this gives room for short term growth in price where they might still be under 1btc, and gives a lot of scope for coins in nodes vs circulation.
should the coin gain serious value, then those static nodes might become very serious, and plausibly the amount necessary might need some reconsideration at some point.
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"a change is good as a holiday"