In reply to xray:
It's rather tricky to compare the warmth of a windproof garment with one that isn't windproof, as a windproof is so much more effective at retaining warmth in 'real conditions', i.e. when there's any sort of breeze.
The Core Skin uses Polartec PowerShield with R1 waffle fleece lining, which is roughly 100 weight fleece. Given that it's much more windproof than a simple fleece, I think you'd find it about as warm as your 200 weight non-windproof fleece in use.
I prefer a more windproof outer than PowerShield provides, and so favour the DriClime-style pertex/microfleece type garments, but others are keen on PowerShield; Dave Hunter, for instance, seems a recent convert. It feels more rugged than pertex/microfleece, and looks better
Jon - I think the 810 jacket is called the 'Zone 3'; Sprayway seem to have ripped off Patagonia's 'Regulator' nomenclature and replaced it with 'Zone'. I'm quite pleased with my '812 Zone 2' (well, at £18 from TKM...).