You mentioned VPS/dedicated/shared plans with inmotionhosting.com but I noticed that they have an "entry-level" dedicated server that seems quite cheap (almost too good to be true!) at $35/mo:
16GB DDR3 RAM
1TB SSD
Xeon® E3-1246 v3* (4 Core / 8 Thread)
1 Dedicated IPs
I'm currently on a 2x/dual Intel Xeon E5620 (2.4 GHz) server with 12GB of RAM and regular HDD (not SSD) that is over a decade old. Would the above server easily handle the same load (or possibly even do a better job at it?)? Would the tradgang.com forum you moved to SMF run on such a dedicated server without issues?
My other questions remain valid but I apologize Ruben for getting the server info wrong.

The $35 dedicated server option is just for the first month ($70 thereafter), so the real server choice to consider would be the following:
32GB DDR4 RAM
2TB SSD
Xeon® E-2134* (4 Core / 8 Thread)
5 Dedicated IPs
Would this easily handle the tradgang.com forum as well as anything you could throw at a 2x/dual
intel Xeon E5620 (2.4 GHz) + 12GB of RAM?