Having taken the recommended nights sleep on the matter and the advice here, I am torn between the 20° Incubator vs. the 20° Phoenix.
I'm putting up a poll and am going to go with your advice. I figure I'll likely be happy with any choice, and if not - someone will get a discount when I put it in the For Sale forum.
I have previously never owned any shelter that had such an enthusiatic fan base of knowledgeable gear addicts. You're my kind of people. Thanks for all your help and advice.