Right server to buy from a decent provider ...
 

Hostsailor.com and legionbox.com servers are enticing for me and I want to know more info their activity in the Internet, so what should I do?

Resources is the first thing you look at in a host, if it provides the space, bandwidth and add-on domains you need in case your site becomes successful.

I can recommend you to look at Gpuservers.net as a nice alternative.
It has done a great job at evaluating the competition and narrowing it down to a handful of highly qualified services.

I know Okayservers.com is a good place for getting powerful dedicated server hosting packages along with Ddos protection and 99.9% uptime guarantee. Their uptime is fantastic and ability to upgrade and downgrade is a plus.

Hostsailor.com as well as legionbox.com are solid and trustworthy.
Reliable servers are excellent, trustworthy and really powerful - love all the features and the support.