for that price you could buy a server PSU, those are built to last longer and are usually more powerfull. I got a 2400W PSU for around 100$.
You could find cheaper risers from Aliexpress too (see signature for mines), same for SSD you don't need a big brand.

I have exactly the same motherboard, you'll need to find risers that are not too big because PCIe slots are really close to each other.

GTX 1060 was very interesting up to some weeks ago. I got my last one around 170€ but now exactly the same are around 300€.