I don't see mention of Tarptent, when you include price, robustness and service, its very good. More so for USA than UK though.
I pond hop which is good to avoid the UK population's density to vote in high-taxation politicians with the 20% VAT. From that I find the UK's Paramo wins for cold damp situations, PHD wins for best lightweight down, I got 2 of their bags and a vest, Montbell wins for best value down (Parka), Tarptent wins for best tent (Notch, followed by SS1 and Protrail), Black Diamond for best poles, Inov8 for best lightweight shoes, Montane for best windproofs and trousers, Golite (no more!) for best value pack (Peak and Jam), OMM for best lightweight warmer wet situations.
My most long-lived items are Paramo, they just keep going......
Issue with warm baselayers is if you get active and too hot then you're talking having to strip down to skin to then re-layer backup. 4 layers should be sufficient. Base, fleece, windproof and down / primaloft. A warm baselayer which is fairly porous if you did strip down to base to get most ventilation is Paramo Grid.