SM951 Alternative for Mac Pro 5.1

I want to upgrade my system drive (PCIe). All advise SM951 AHCI, but recently it isn't available to purchase and the prices of it are too high (there where it is). Advise me please good option for installation in Lycom DT-120. Besides that I need your opinion about INTEGRAL ULTIMAPRO X M.2 2280 PCIE 8GBPS AHCI SSD.
http://www.integralmemory.com/product/ultimapro-x-m2-2280-pcie-8gbps-ahci-ssd
Somebody...

SM951 Alternative for Mac Pro 5.1