Well I can't imagine it being an insignificant purchase, but neither will it break the bank, nor should it. The Defence budget is increasing by a significant amount over the next few years, and there should be more than enough money to plug an existing hole like this, a hole which should have been filled 6 years ago. It won't just be 30 SPA systems though, it will also include the resupply vehicles which are generally based on the same vehicle, so the K9 has the K10 ARV, the M109A7 (or A8) has the M992 FAASV and so on. So the buy will have to include enough ARV's to support the battery/regiment as well, probably half or upwards to equal number of ARV's. So the total buy could be for up to 45-50 or even 60 vehicles total. EDIT: Looking at the numbers of ARV's across the SK Army K9 fleet, it looks like there are approximately 179 ARV's supporting 1136 K9's, so about 1 ARV per 6 K9 on average. If 2 were to support each battery it would provide 208 extra rounds plus the ready rounds in the K9's, that's a whole lot of sustained firepower. M777A2 I'd imagine will have a place going forward, as an air transportable artillery piece and as a part of any light/motorised formation, some could certainly stay in the regular artillery regiments but most I think should be handed over the Reserve RAA units so they can actually have a decent artillery capability again.