Each one will make you $3.50 a day. Power consumption from the wall is around 110Watts per GPU with a high efficiency PSU.
Nobody knows how much longer ETH mining will be profitable, invest only what you are prepared to lose.
I will be making $3.50 each including or excluding the power consumption charge?
And yeah I decided to invest on rig so,while ethereum is profitable I will mine and move on to other Alts/Algos when no longer profitable