Just one minor point, although if you are taking five people it may not be so minor. The Global Explorer fares ex-Canada went up on 15 April. The 34,000 mile economy is now C$5,099 and business is C$8,999. Unfortunately, FewMiles' site has not been updated in some time so the fares and rules there are a bit out of date.

You can see a current copy of the rules and the new fares here.