How about an S3? Well, one of those currently expects to earn about $0.86 a day. At 340W, it'll cost you $1.22 a day to run. Oops... that's not gonna work.
Ok, how about an S5? 1155GH/s expects to make you $2.25 a day. 590W will cost you $2.12 a day. OK, you're making about $0.13 a day.
So, in a nutshell, you can take your chances with the S7 - and it's taking a hell of a chance - or look at other options like hosting.
That is not going to happen, for the S7. Don't forget the halving coming, at which point it would be half 9.46$ = 4.73$ per day minus 4.32$ =41 cents per day. And with the reality of raising difficulty, this is simply not ROI-able.
That electricity cost is completely prohibitive. I think the host fee for cloud hosting is 0.08$/kWh which is already high in itself and take up nearly if not all profit away from the investor. So if you "Really" want to invest in mining, the best bet that i can tell right now would be to buy a S7 on Hashnest.
Check the hosting cost, if its still 8 cents per kWh then you're in for not much profit but at least you can bail out at any time.