Which Nord should I buy?

[anotherscott]

And for Organ, nothing beats a waterfall keybed...

True, but other kinds fall short by different amounts, and even some waterfalls are better than others (Roland VR700 and VK8, and Numa Organ 2, are some waterfalls that I like better than Nord's). Non-waterfall semi-weighted and unweighted actions are closer to waterfall in organ suitability than hammer actions are. And then, within hammer actions, some (like Nord's HA models, Kawai MP7, some of the Kurzweils), while not as good as any of the above, are still noticeably better for organ than other hammer actions. The HP actions are close to the bottom. That said, if your organ playing does not employ much in terms of organ-specific techniques, you can sometimes still manage just fine on pretty much anything. "Light My Fire" plays perfectly fine on a hammer action board.

[Quai34]

Ok, I didn't know about that, I've never tried the waterfall keybed of the sus mentioned keybed but I like the key beds of my D50, DSI p12 and P08 and D50...I don't think I have much difference between them beside the fact that the DSI have more ability to do deep after touch but it could be adjusted anyhow...And didn't know about the better keybed of the Numa Organ or Roland VK8, thanks for the info...

[anotherscott]

Yes, because waterfall only tells you the shape of the keys, and there are other differences in keys besides shape. Some waterfalls require more force to play than others, or push back harder on their way up. And the landings may have different feels (aftertouch being one possible variable). They may also trigger and release at different points in their travel. So yeah, they're not all interchangeable or equal in feel, and so people can definitely prefer the feel of some waterfall actions to others. (And like just about everything else, people have their individual preferences and don't always agree about what is better than what.) And in terms of shape, the biggest advantage of waterfall is the ability to palm-smear along the front edge of the keys... this is an organ technique that is important to some players, and completely unused by others. Having a solid "side" to the keys can be helpful as well, better for smears along the top of the keys... all waterfall keys have that benefit too... some non-waterfall keys have that benefit too, and some do not.