I too had this dream of the perfect jacket, then ten years back I won a jacket voucher in a photo competition and spunked it all on an Arc'teryx Kappa. I wasn't disappointed, have since bought another on sale from Sportpursuit for £180 i think.
Does all you want, in very cold, still conditions not quite as warm as a duvet but in more typical grit weather is as good or better, but less prone to overheating on walk-ins. Completely windproof and sufficiently shower proof to seal with anything but a prolonged down pour.
Bonus benefit is the shell on the shoulders and arms is completely bombproof, you can slide down a grit chimney or burrow through blackthorn and it just shrugs it off. Plus the fit and hood are really good. Can't fault it.