First Lite all the way. Base layers are the most important thing. I guide in the wilderness all summer and fall..I have to pack in what i need for each entire 10 day hunt. I live and die by merino wool layering system. I personally use First Lite. I dont have anything bad to say about other companies, thats just my preference as they make great products, especially with their continuing outer layer system now. Spend your money on base layer stuff first...You can get by with some sort of waterproof jacket/pants combo over that, but if you wear underlayers that do not wick away your sweat, you will become miserable if it gets cold after working up a sweat. Sometimes I wear just a basic Carhartt waterproof jacket over my base layers. You dont need Wool for everything, But its definitely worth the investment where it counts. If you can afford Sleeping Indian/King of the Mountain for outer layers, it is incredible wool clothing. . But if you want to get something Wool for the outer layers as well another good option besides the Army surplus type route which works great, is the Columbia wool which is very reasonably priced and holds up decently well especially for the price.