In reply to Morgan Woods: This is fun. I think I'd nominate my Marmot Spire Goretex Proshell Hardshell. Still performing perfectly after 5 years' hard use. I took a long time in choosing the right jacket. Designs were less winter friendly just 5 years ago and it was the only option in what you might call the medium-upper price range (I paid £200 online against a RRP of £300 - quite a lot in those days for a cagoule) to combine all the features I then considered essential:
Helmet hood with size adjuster for wearing over the head only
Velcro tabbed cuffs
Goretex proshell
Pit zips
Inner pocket
Harness-friendly pockets
Adjustable high front collar (over nose) for wind protection on a belay or chairlift
Cuffs big enough to fit over gauntlets (not the other way round) for complete snow seal.
The above just reads like a rollcall of all the features common to all modern winter jackets, but at the time it was nigh impossible to find a jacket combining all those features. Especially the last two demands.
Bought in a size Large for freedom of movement while snowboarding my only regret now is that I didn't get a climbing-friendly Medium. The damn thing just refuses to wear out so I can get a new one!