There really, really should be a tekkit server which actually has the features which make Tekkit fun.
It should be obvious to have all Mods since its called Tekkit and not "Industrial Craft and Optifine". I recently saw a server which had EE, Build Craft and Red Power deactivated and even prohibited IC Nuclear Components. I would be content if the guys just block Nuke, RM and DM furnaces, but they seem to block everything.
Secondly, the server should be friendly and PvE. (PvP is just worthless with Quantum Armor) It should be easy to start building, for example, having a public Portal.
Thirdly, the Server should be easy to register on, perhaps utilising a Plugin to register Players.
If the Server has all these properties, it would probably be awesome.