NXT is 100% Proof of Stake and seems to me to be a good protocol.  Sure the initial investors will be gozillionaires (so are the bitcoin early adopters), but eventually all those coins will be relatively evenly distributed if there are enough people involved in the network.  Even hoarders will eventually succumb to the lure of high prices and sell their coins for either goods/services or fiat.  The price will fall temporarily and people will scoop up cheap coins and there will be a more even distribution.  Plus, the whole electricity savings thing, I think, will be a big issue in the future. Sadly, right now, you have to be pretty rich to afford mining…..