In most cases, you should reserve creation of a whole new server topic to when you're hosting the server yourself, or a friend is. If you come across a server and think it's good, just go ahead and post it in the MC megathread. People WILL see it, but if they don't respond, just a wait a bit and bring it up again...keep in mind that plenty of people will see a post or a topic and not post, but definitely acknowledge what it's saying.