Based on your aspiration to get an 883r, I’d think that you would be happier with another bike that also has more of a standard riding position — so that that would be the Ninja or the TU.
The TU has a similar asthetic to the 883, barebones look with everything exposed, so that might be more appealing.
One thing to consider is whether your ride will involve much highway-speed driving or cold/rain riding. If so, the Ninja’s fairing and shield can be big bonuses.
Nothing against the S40, but it has a more foot forward position that you find on cruisers — very different from the 883r.