from what I've heard of the new original prusa - yes it is worth the money, not sure if the new model is out yet though.

Also it will require a lot less modding and fettling before it's of real use, than the other two.

You might want to consider a delta as well.
faster, better quality and much easier to build and maintain and just way more fun to watch :-)
Actually have alook at the tevo's in general - good prices, good components: https://tevo3dprinterstore.com/