good advice northern1.
mac - you are right on about poly pros. they issue them to us and are a beloved part of our TA-50. i cant tell you how many times i wore them in the field in the wee hours of the morning. however, i personally like my underarmor better. it isnt as thick but it is far better when it comes to sweating and wicking the sweat from the body, while still giving an ample amount of warmth.
with the waterproof and windproof bivvy, you would be surprised at how warm and cozy you are inside of these things, not being in a tent. i think the wool blanket is a very good idea, one that i hadnt previously thought of... i was thinking more along the lines of some type of rolled up cushioned sleeping mat that can tie to the bottom of the backpack/rucksack. any experiences with good sleeping mats fellas?
