So CEX's price per GHS is ~0.00627.  Since Peta is now pretty much equivalent to CEX in operation, the current price of ~0.003 for a Peta GHS is a bargain!!

The Peta maintenance fee is lower by my calculations as well:
CEX = 20c per GHS / Month
Peta = 16.4c per GHS / Month (Based on 1150TH @ $625 / BTC)