My wife and I just purchased our Oneworld Explorer RTW tickets and these are the miles they have calculated out for us:

Qantas Airways: 1800 miles
Cathay Pacific: 11358 miles
Finnair: 5451 miles
Iberia: 11752 miles
LAN Airlines: 4664 miles (12019 miles incl. back to Syd)
LAN Peru: 2070 miles

We're not using the last flight back to Sydney from Santiago, since it'll be cheaper to purchase a couple flights from South America back home to Canada. Do we still get points since we have that last Santiago - Sydney flight booked?

Anyways, should we just join 1 miles plan out of the above alliance members or should we go ahead and join all of them since they're free, I think?

Thanks!