PoS is definitely the way to go for national crypto-currency!
(As long as you distribute it evenly between the national citizens)

Thanks for the input! PoS seems to be perfectly suited for a national coin, provided that the project gets enough media coverage. We are working to get advertized on the radio, and we also try hard to design the Airdrop system as simple as possible, so that enough people actually claim their coins. Let's see next week how that works out.