Goodluck buddy,
Just get ready for a long period of time before you paid off your hardware. Probably over a year at today's prices and difficulty.
A tip is too be ready for new launching coins that has a future (yes I know its a gamble) and start mining in the beginning. That's where you can make money.
I'm an experienced hodler

Don't run full capacity on 1300 better go for a 1500W PSU.
1500W PSUs seem very very expensive, maybe 2 x 850W could be a better choice, with only one going into the mobo and 3 GPUs and the other handling the other 3