In reply to rgold:
What are people's opinion of/experience with the OR Cathode Hoody? What about jackets like the ME Kinesis, Rab Alpha Direct, or OR Ferrosi Hoody? Where do they sit on the spectrum of warmth vs breathability?
The reason I ask is that I've got a similar "problem" to the OP in that I'm looking to update/alter my layering system by reducing the number of items I use/carry (and thereby reducing weight). My current items include: Icebreaker Quantum Hoody, Rab Boreas windshell, Rab Generator Stretch Pullover, Arc'teryx Beta AR Goretex Paclite shell.
The Icebreaker hoody has been my go-to piece that I wear everyday for everything. It has seen a lot of rock climbing action and is starting to look a bit tatty with various holes in the arms (that I'll hopefully get repaired). The combination of Icebreaker hoody + Boreas is generally warm enough throughout most of the year, at least for the conditions I typically (try to) climb in. When the weather gets particularly cold (i.e. middle of UK winter in Peak), the Rab Generator adds extra warmth. The Beta AR goretex basically stays in my pack until it rains.
I should note that I don't do any winter climbing or mountaineering. I primarily stick to rock routes, ala the Verdon Gorge at Easter, Ecrin in July, Dolomites in September, Peak in Autumn and Winter, North Wales and Pembroke in Summer etc. etc.
The biggest downside to my current layers is that neither the Icebreaker, nor Rab Generator, nor Arc'teryx shell can be attached to my harness (without using some other stuff sack). The Generator doesn't have a hood, which is why I've preferentially used the Icebreaker as my primary cool weather climbing layer and the Boreas wets out instantly (as you'd expect). Also, I'm pretty sure that the Beta AR shell is overkill for how I use it.
Similar to the OP, I've been wondering if I could replace my Icebreaker and Generator with something equivalent and replace the Boreas and Beta AR with a lightweight shell thus cutting the number of items from 4 to 2. I'm particularly trying to streamlise my kit for when I'm multipitching so that I don't have to take a rucksack but can still carry enough layers.
The difficulty, like all things gear related, is knowing what to choose. Any thoughts/advice will be appreciated and to the OP, I apologise for hijacking your thread.