There are a few. I am a part of the Dark and Light myself, but I also enjoyed the Council of Earna. Also, Elemental Magick was informative. They are all good, in their own right. You just have to find what is right for you.
Some people don't need covens though, so if you don't find one here that matches you and makes you feel at home and happy then don't worry, many successful practitioners have never been part of a coven before.
:) No rush, take your time in deciding, a coven should be your family so it's only to be expected that you'll need time to decide.
What kind of magick do you wish to practice? Most covens here focus on one or a couple while some have a lot more. For example, Council of Earna offers a lot of defense, offense, combat type of stuff if you catch what I'm saying, while Elemental Magick deals with elemental magick. So it all depends on what you're looking for, read each covens description and if none work, do what Lady Snow said and become successful without one. Good Luck