To my mind you can't go wrong with the merino wool shirts from Ibex. The are light, wash easy super comfortable and they don't stink if worn for protracted periods. What they say about their suff is true.

Check them out here:

http://www.ibexwear.com/shop/products/2/54/mens-long-sleeve-shirts

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Patagonia Capilene 3 Crew. Bonus: made from recycled material and recyclable. http://www.patagonia.com/web/us/product/mens-capilene-baselayer-3-crew?p=44420-0-197

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pricey... but remember you asked for THE BEST!

Http://www.underarmor.com

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The Gap

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Nike extreme cold thermals. I use it for skiing it is very warm.

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