Don't rush into the next-best guild. You may be shocked about their rites once you are in.

Take your time. Get to know both the computer and the player controlled inhabitants of the cities. Build your character, create its history before you run for its future. PlaneShift is a rather slow-paced thing.
I can't recommend you one or another guild, because only you will know where your character fits. There are so many different criterions. Some guilds have a quite distinct point of view. Some accept only a distinct range of members (e.g. of a specific race).
Being a "guild hopper", joining and leaving them one week after another, won't give you a good renown.