The PoS mechanism in NXT may be better (I have not seen any real details of it),
It is. It disables the staking ability of any holder that isn't actively generating blocks.
https://bitcointalk.org/index.php?topic=364218.0http://prisonorfreedom.com/what-is-transparent-forging-in-nextcoin-nxt/Sorry, I'm going to get wrapped on the knuckles now for spamming the thread with "foreign coin" off-topic subjects, so to save my meak bones I'll stop there, however I simply had to challenge this assertion of "fundamentally flawed" re. POS technologies and 51%ing which has come a long way since Peercoin.