A few things i have learned from experience about Tires, and winter tires. Having lived in Montreal, Qc for 25 years, and driven in all winter conditions known to man...here is my take:
#1 - NOTHING can beat having DEDICATED WINTER TIRES - not even the best all season tires.
#2 - You get what you pay for in tires - buy the best your budget allows, in your case $ is no object, so that's an easy one
#3 - Have Winter tires on separate rims is a no brainer for me because:
a) It costs less to swap tires, because I don't have to pay for re-balancing the tires each season
b) Saves wear and tear and damage to my summer rims
c) Salt wear/tear on my summer rims is non-existent because I have dedicated winter rims
Like anything on the market today, there are TONS of choices - and lots of info online, print etc to confuse you. Why not visit a few shops and ask them why THEY think Tire A is better than Tire B, and see if their just parroting the marketing info to you, or can give you REAL world info based on their own experience or customers'. Just because a specific tire is popular, doesn't mean it's the BEST - BUT, the reverse is true sometimes too.