A couple of small points of order.
In the ACCS era the CRCs will not be NATO funded but paid for by the nation as they become the highest level of national control. The only bit that NATO will pay for is the CIS connectivity from CRC upwards to CAOC.
The new NATO HQ will indeed be a costly affair but if you've visited the current location you'll know it is falling apart and may not last the 10 years expected before the new building is ready. Oh and the new building will be funded from the NATO Civil Budget and hence the UK share will be paid for by the FCO. Thus it is not in competition for funds with any other NATO infrastructure projects.