I'm planning a RTW trip with my wife for Feb/Mar 2018, so I'm looking at similar flights for Feb/Mar 2017 to try to gauge the price (in dollars or points) for the trip. Figuring it out in points is tough, and I'd appreciate any tips to help. Apologies if there is a more appropriate forum, but I didn't see a RTW dedicated one...

My trip is SJC-NRT-PVG-HKG-CDG-MCO-SNA-SJC, and we plan to fly in Business. I put together a potential itinerary with same day-of-week flights on http://www.staralliance.com/en/book-fly, and the trip shows as around $20,000 total for both passengers.

I checked a bunch of the RTW point redemption pages, and it seems like different airlines have vastly different charges.

On ANA, for my flight, based on 23516 miles of travel, their redemption page says I can fly business for 145,000 miles each, which seems like quite a bargain! However, I have read around that ANA charges significantly higher taxes and surcharges than most. But I can't figure out how to check what I would actually be charged on ANA's website, and can't even book the identical itinerary there.

According to PointsGuy, Air Canada's Aeroplan would charge me more than double the miles, at 300,000 per passenger for business. Lufthansa is even more, 325,000. Singapore is 240,000. But all of these accept point transfers from AmEx, so I'm open for whatever would end up best.

How does one go about determining the complete cost of these packages? And if I find an itinerary on staralliance.com, can I book that itinerary on any Star Alliance partner airline?

Thanks...