Accepted, I just think that with the deteriorating world situation we may be better off defence wise with 6-8 TA/FA50's which could be got for the same price and get a dedicated VIP/passenger pod/pods for the C17/C2/A400
Given the current worldwide deteriorating geopolitical situation, one would think that it would be enough for our pollies to active consider substantially more investment in NZDF capabilities above and beyond the NZ$20 billion already announced. To whit, one capability, as you suggest, the reintroduction of an ACF.
However I think that the pollies have not had a sufficient enough of a scare to cause their sphincter muscles to cease operation, so we will undoubtedly have to wait until unwelcome and unfriendly foreign devils are storming the beaches in Auckland and Wellington before our pollies would actually sit up and take notice. Seriously though, they are burying their heads like the ostrich in the sand whilst the situation deteriorates further at a quicker pace and this time we do not have the British Empire to fall back on, nor do we have a functioning defence treaty with the US. That lack of a treaty has both its good points and its bad points, however my belief is that in the long term the bad points outweigh the good points. Secondly, unlike WW2 it will take much longer to rebuild and re-equip NZDF, in this case the RNZAF, to enable it to fight alongside our allies and coalition partners.
Therefore we need to look at two scenarios which look at two different funding level by the NZG. The first is funding at the present level with the possibility of a small increase of funding to cover an ACF. The second is where the pollies sphincter muscles have gone on strike and they've needed to change their underwear, which results in a significantly large and substantial increase in defence funding.
Under the first scenario, KAI TA / FA 50s would probably be the platform of choice if it was decided to go with new build aircraft. Or used F16s from the Boneyard and gradually upgraded if it was decided to go with used aircraft. Maybe 12 aircraft at first with the possibility of another 6 further down the track.
Under the second scenario the if NZG policy and funding permitted a new buy of combat aircraft then rather than a new buy of F16s or Gripens, for an extra US$10 million (projected 2019 flyaway cost) we could acquire F35s. IMHO the F35B rather than the F35A because I feel that the B gives us greater versatility than the A would. The F35B appears to cost US$15 million more than the A so we would be looking at possibly US$95 million flyaway per aircraft. Still cheaper than the Rafale, Typhoon or F15 and a lot more effective. Because NZDF is / has stood up a JATF which is an expeditionary force, the F35B would be the ideal fit for such a fit, able to be lillypadded on LHDs and operate from very austere strips just behind the front lines. Otherwise very similar to how the USMC operate theirs. It would also add a capability to an ANZAC Force that is at present absent. Regarding numbers we would be looking at two tranches of 7 aircraft, with the possibility of third tranche further down the track if required. Like the F16 training it would be contracted out, in this case most likely to the USMC. IIRC the Whinwray report stated that a minimum of 18 Skyhawks were required to meet the NZG policy requirements. Using that as a basis, then a minimum of 18 F16s would need to be acquired to meet the same or similar policy requirements. For the same cost 14 F35Bs can be acquired and they would more than meet the policy requirements, plus most likely be an increase in the capability.