As sad as it may seem, most of what you have said is not applicable to the average Joe looking to buy cloud mining power and not get scammed (i.e CEX at least is not a scam and is very reliable in that sense). Also there is still nothing quite like it the trading platform is awesome.
Having said that though please do check your PM.
EDIT: if anyone wants to read our (highly controversial!) CEX review they can do so here:
http://cloudminingreport.com/reviews/cloud-mining-bitcoin-namecoin-devcoin-and-ixcoin-with-cex-io/I used to be very pro-CEX.io, but they simply don't care about the users. They users are there for one thing, to provide then with fresh btc.
I left after they suddenly decided to turn on 2FA for everyone and I was locked out my account for hours because their software couldn't handle the load. That triggered a major slide in the price of GHS and I ended up losing btc. CEX.io customer support response to that was "Oh we had a bug, everything is fine now."
I went to scrypt.cc with is about 1000 times better than CEX.io could ever hope to be when it comes to what matters, making a real mining profit.
while I do not like CEX anymore either and I used to be pro-CEX as well scrypt.cc is not very good either. I tried them out for a week or two and they have a long way to go. THe price per kh does drop and fluctate just as much as cex (even though people on this forum said otherwise). Also their is no charts since its being "optimized" for a while now and trading on that site has a pretty bad delay for both buy and sell orders as well as when you cancel orders