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I would like to host 10 sites at powerful server account

You'd better give Jelastic.com auto-clustered solutions a try!
It has a unique pay-as-you-use pricing model and is available as public, private, hybrid and multi-cloud in about 60 data centers worldwide.
Taking into account your requirements, can also recommend you to look through HostingSource.com dedicated servers in the USA.
Save Big on Hosting - 50% off 1st month on all Servers/VPS plans.
I would like to host 10 sites and need reliable host with responsive customer support.
What can you say about HostRound.com dedicated web hosting services?
What host is better from your views?

Hi there!

Do you need any control panel, like cPanel, or have any other specific requirements for the environment to have your websites hosted?

- Shared Hosting or VPS?
- Managed or Unmanaged?
- Any preference for the software supported (e.g. Nginx, Apache, IIS, Mysql, etc)

The more details you can provide the better the recommendations we can give :)
I can also recommend you to look at Cloudarion.com and their servers in Switzerland, Germany, Usa and Russia.
They have one click installs that you can install on your server with just one click of a button.