Suggested HArdware for a minecraft server!

you need a real graphic card for a fast map load, you are also many ressource pack with low graphic texture for little config

Minecraft and generally JVMs (what spigot uses to run) require single thread performance.
Depending on the player base and plugins you can start from lower tier hosting and move on to something more expensive (i.e a dedicated server with an i7-7700k)

Just have a good cpu and decent ram (min 4gb) minecraft is cpu intesive

Minecraft is abou RAM, so, more ram = better, I personally recommend any i3 cpu or amd equivalent, with at least 4gb ram