Mod the bios on your GPU and mine ETH at 28-29MH/s and also dual mine SIA for maximum profit.
Just go to your local computer store and buy the motherboard in stock with the most PCIe slots and start mining tonight instead of waiting for all your stock to arrive and the profitability starts to decline.
You are losing at least $5 USD a day per GPU that your GPUs are not plugged in.
Most of your components you can buy locally however for the risers .... "You might have to overnight them from China". Since computer stores generally don't sell them.