What does everyone think for these brands and cold gear. I am talking low 40s down to single digits. I have my mid to upper 40s and and above figure out. I want to upgrade base layers, bibs and jacket with some gear where I am not freezing my ass off after 2 hours. I've read review and watched the vids. I am thinking either the Sitka Fanatic II system or the First Lite sanctuary. The Sitka cost about $200 more for the set that First Lite. Buf if the Sitka is much better I am not as concerned. Also looking at several brand for merino wool base layers. What is everyone using for that? Thanks in advance.