I went through a merino wool phase a couple years ago. So I still have a lot of merino base layers, socks, etc from various companies and various blends.
But I am less enamored with merino now because it seems to hold moisture. Yes, it remains warm when damp, but stays damp, clammy, and heavy. I was actually a bit shocked at how heavy one of my base layer jerseys was when I removed it after a ride. I just prefer a fabric that dries more quickly, while riding, and doesn't get "clammy" feeling.
So back to good old polypro, acrylic, etc. for me. Merino is good, but not that good. there are a lot cheaper alternatives that function as well or better (IMO)
I have an Ibex Merino wool mock turtleneck sleeveless turtleneck. Been trying to find another one because I accidentally got it chewed up in the garbage disposal (I hand wash all of my cycling stuff, somehow it got sucked down the sink when I drained it
) Anyway, I agree, the Merino stays a little damp so I really only use it on really cold days where I won't sweat a lot or on 60-70 degree days with low humidity. The material I find that is best for cold days is Polypropylene. It is considered "old school" but it does not stay damp next to the skin, provides warmth, and dries quickly, and it is inexpensive.