If I had an NVME, I believe I could decrease the IBD to 1/2 of the time.
I think a system with 32 GB RAM and HDD could be faster than the same system with 8 GB RAM and NVMe 
yeah a wd gold 8tb hdd is fast enough with a good cpu and ram of
32gb or more.
https://www.amazon.com/gp/product/B0CVMZTBJ4/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&th=1
I have done a lot of pcs running nodes.
Ram is a big deal