cex.io needs to come down below 0.04 BTC before it is worth buying. The current price of 0.074 BTC is absurd. Most people buying at that price are going to lose money.
What is the best cloud mining group?
I've looked at a few websites.
and I've tried cex.io, but now I think
http://bit-mining.co/ is one of the better ones.
Compared to cex.io, the prices are much more favorable and there are daily payouts.
But the advantage of cex.io compared to bit-mining.co is that you can trade your GH/s really easily.