last fall I used the Celsius bib, Ascent pant and core bottoms, and the 90% jacket, Jetstream vest, and core top for sitting in treestands. I would suggest using the Celsius Jacket instead as it has more insulation.
In 2010 Sitka is coming out with the Stratus line. It would be ideal for sitting in a treestand and I look forward to trying some.
I think using the Celsius or Stratus lines along with some base layers will be great for sitting in a tree.
I am not too familiar with the other brands you are asking about, but I hope this helps.
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