Don't listen to those who post dogmatic responses. This is a question each person has to decide for themselves.
In your case you left a few clues for us to ponder:
1. You don't need an iPad desperately, for you are merely pondering the question at the moment.
2. It really bothers you when a newer version comes out.
3. You are able to wait as long as six months if necessary.
In your case, wait. There will definitely be a new version of the iPad within six months. I don't know if it will be an "epic" update, but it will be an update. You will then probably have a full year to enjoy it before a new version ruins your mood. And since you evidently are able to wait, you are not putting a hardship on yourself by waiting.
If I've read you wrong, and you are desperate to get one, then do so. You'll get six months of fun out of it and then you can sell it and upgrade to the new one for some extra cost than if you waited. Is six months of fun worth the extra cost? Go for it.