So what's the general consensus on S7?
Expensive but long term gain worth it?
Or but cheap S5 at like 0.9/0.8btc per miner?
The s7 seems a better option as the mining reward is halving next june. IF the roi is before then, then you are fine but at that time the mainteance will be greater than the rewards that you get. Unless you want the miner to be delivered to you next year of course. If so then set up another account with the S5 so you don't lose any of your bitcoins!