Take what I have with a grain of salt, as my feedback is based on what I hear as a mod developer, and not personal experience.
Without diving into hardware specifics and all those things, I’ll just gently direct you towards ServerBlend as a host. Lots of people use my mods, across all sorts of server rental places. And ServerBlend has been easily the number 1 good feedback I’ve “heard” for probably the past 1-2 years. On the flipside, Gportal is by far the worse in both complaints and headaches I have to deal with as a mod developer.
You can see their hardware specs on their FAQ page. Perhaps @drachenfeles can provide additional info with regards to the hardware they are using.