i'm just gonna go with GPU set up actually.
i went ahead and bought a few 3070 GPUs. I'll buy more to have 6 of them.

Along with those,
Intel Xeon L5630 2.13GHz SLBVD 12MB LGA1366 Quad Core Processor MATCHING PAIR
Supermicro X8DTE Dual Socket 1366 E-ATX Motherboard DDR3 SATA2 w/ I/O Shield
 Both are refurbished/used. like $60 for both.
Do you guys think this is the best combo?