MAN to NZ Business Class

I am planing a trip to visit family in New Zealand. There will be 4 of us travelling 2 adults 2 children aged approx 4 and 8 at time of travel.
I should have 180K miles x 2, plus 2 VCC companion tickets when I book.
I see the three main options as VA via Hong Kong and Sydney, SQ via Singapore and NZ via LA.
There would appear to be pros and cons to each route in terms of flight timings, Suite as opposed to Space Bed etc.
I am tempted by VA partly because I think it will be the easiest to book with 3 reward and 1 J ticket. Plus I would like to see HK and Sydney.
However SQ would be more direct and potentially cheaper as we could fly direct from Manchester. How easy it is to book reward flights with a partner airline and what do you predict availabilty will be like if I book at the 11th month window? Can I book cash tickets through FC as well as reward and book them all at the same time to ensure getting all the seats on the same flight?
Air New Zealand has its appeal because of the flight times, but apart from special offers the price does seem to be the most expensive.
Any advice and suggestions gratefully received.
David
I should have 180K miles x 2, plus 2 VCC companion tickets when I book.
I see the three main options as VA via Hong Kong and Sydney, SQ via Singapore and NZ via LA.
There would appear to be pros and cons to each route in terms of flight timings, Suite as opposed to Space Bed etc.
I am tempted by VA partly because I think it will be the easiest to book with 3 reward and 1 J ticket. Plus I would like to see HK and Sydney.
However SQ would be more direct and potentially cheaper as we could fly direct from Manchester. How easy it is to book reward flights with a partner airline and what do you predict availabilty will be like if I book at the 11th month window? Can I book cash tickets through FC as well as reward and book them all at the same time to ensure getting all the seats on the same flight?
Air New Zealand has its appeal because of the flight times, but apart from special offers the price does seem to be the most expensive.
Any advice and suggestions gratefully received.
David