I'd like to know when you are going to buy a host which features do you take into consideration before sticking to any?

This question has been asked before, so I'll tell again, the most important thing is to understand that there is a limit to the number of processes executed on the server per second for every account, so you should be aware of that and know your needs, so whenever you are going for powerful hosting, "disc space" parameter can't help you a lot, it's necessary to look at CPU, RAM and RAID usage .