Free electricity is the best but if you pay any amount for electricity, you will have to calculate with it. Since you are in waiting already, in your place I would wait the R4 hardware. You don't have to buy the software as there are very good open-source software. You still should do proper optimization and maybe it's worth the look up the parameters in related guides depends on what software you will use.
Do not believe everything you read.
R4 is already on sale a week.
https://shop.bitmain.com/productDetail.htm?pid=00020160829050856183dK8A4TFO0645Even More overpriced than the S9 .
Today you can only use with them one software BMminer Version 1.0.0
You are right.
That's right, I didn't see that. Is BMminer not open-source, though? As far as I know, BMminer doesn't respect the open source license. Will we be able to use that miner with other software in the future?