Contrasting Options for ORR 600km

I'm organizing the fall 600km ride for the Oregon Randonneurs. My initial thinking was that a challenging ride was in order. Cold, high and far - something to lift the spirits with a feeling of accomplishment at the end of the season. Then, I faced the wall that was the SIR 1000km in September of 2007. It was nasty up there. And wet. And very cold. 400km and change was plenty of that for me. And so I was inspired to sketch out a lowland option. Below are indicators of each option. Whichever it is - the details will vary. But, these are enough to give one an idea for each option.

Here's the high option:

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Or

One could stay low: