Proof of Stake
Ambercoin Rate of return 7% per year ,Dev AmberCoinDev
BitBean Fixed rate of return 1000 per block , Dev TeamBean
Blackcoin Rate of return 1% per year ,Dev Rat4
Bottlecaps Rate of return 200% per year, ,Dev Tranz
Diamond Rate of return 25% per year, , Dev Danbi
HoboNickels Rate of return 2% every 10 Day, ,Dev Tranz
Kobocoin Rate of return 10% per year, ,Dev TheTribesman
Mintcoin Rate of return 10%, drop down to 5% in 2017 , Dev Fuzzbawls
Netcoin Rate of return 20% per year,
Noblecoin Rate of return 8% per year, , Dev EagleFlies
PhilosopherStone Rate of return ~50% per year , No Dev at the moment
Supercoin Rate set to drop to 5% per year soon, but has Anon feature , Dev Griffin
Tekcoin Rate of return ~20% a month depending on difficulty , Dev Noise23
ZEIT If you have not guessed , My Personal Favorite , 15% Harvest rate dropping down to 5% Harvest rate per year by 2017 ,
Dev Rent_a_RayFor Research use CoinMarketcap to see pricing & total supply as some are a few cents with only a million coins and some others only a few satochi but billions of coins.
Plus read their discussion forms, to see the coin's general mood and direction.
You will also want to determine what amount of coins is needed per block to stake as fast as possible to gleam the effect of compound interest.
If you decide on any of them, Here is a link to my bootstrap service to save time syncing with the coin's network.
Kiklo's Bootstrap.dat & Blockchain Snapshot for Proof of Stake Coins