Hey nico1102,
There are so many options out there. It really does depend on what you want / need. My name is Tom, and I am from CraftSRV Ltd. We manufacturer GamePanel.io, which is a game server panel designed for large scale use (perfect for hosting providers). Our previous product, named CraftSRV was a big hit amongst hosts and GamePanel.io is working it's way up there too.
As I say, it depends what you need. We provide the ability to run Source Games including Left 4 Dead 2 and Garrys mod, whilst also supporting Minecraft and Minecraft Pocket edition. We provide a provisioning module and are listed in the WHMCS marketplace.
We also include all of the features that you made clear that you desire.
I'd be happy to talk publicly further about your requirements and see if we meet them. You are of course able to try our software for free. Just visit the website and order our trial
At first look, we aren't the cheapest product on the market, however when you begin to scale you begin to save. Some of our competitors do not differentiate pricing on their products that enable scalability but we do! Each additional 'node' is cheaper than the base package, whereas some charge the same price for EVERY expansion.
Let me know what you think, and if you have any other questions.
Tom
PS - We have a page that you can get cake from!