I've never seen a z coil (maybe I have, but I didn't know it). Can you post a link?

I would recommend thinking about the length of the stabilizer. You probably don't want a 30"er, which is designed for target archery, but you will want one that has enough weight on the end for your bow to fall forward after the shot. You are probably planing to hunt with it, so keep it under a foot in length. It is a lot easier to drag a short stabiliser through the woods than a super long one, plus, some states require that your stabilizer be less than a certain length. In Minnesota, it's a foot. I use the Octane, which does cost $80, but it looks really cool and is just as effective as those specialty stabilizers that cost even more. Check you the link and watch the intro video. It's pretty cool.

If you have the time, read this link, it may help you. Choosing the right archery Stabilizer.