Recommended hardware depends on the traffic coming into website. It is very important to have fast, smooth and stable Internet connection to the server. It is not recommended to use VPS hosting, use pure Dedicated Linux server instead for better performance, stable and smooth video connection.
We recommend to use our hosting, we are working with 2 datacenter: in Europe and in USA. Our prices are competitive and having both hosting and software support at one company would help to fix possible issues faster and efficient.
If you choose to be hosted with another company it is not a problem, contact us to get hardware recommendations. Use CentOS Linux latest stable version.