My 3D mouse is a Space Navigator, which is the older version of the current Space Mouse Compact. For me, if I was buying my first one now I would probably get the Space Mouse Wireless, since I do a lot of sessions on my laptop away from my office — so the portability is a big consideration.
If I was only going to use it at my desk, then yes I would get the SpaceMouse Pro for the extra buttons. (I'm planning on upgrading once they offer a Bluetooth version).
For the tablet I would buy the Wacom Intuos Small Bluetooth version. If you're buying the tablet primarily as a mouse replacement (and not for digital art) then the compact dimension and smaller active area make it a lot easier to navigate the screen. In my case I have a 13" MacBook paired to a Dell U3415W with the screen mapping as follows:
(note that you set the screen mapping in pen mode, then switch to mouse mode for use.)
Again, if you're not a digital artist, there's no need for the Intuos Pro — which varies primarily in the pressure levels (8K vs 4K), different texture sheets (for variable surface friction or 'tooth') and the pen (which is more substantial and adds tilt recognition). The new Pro Pen 3D does look nice (Aaron tried one on a recent live modelling session over at the SU Forum), and adds a 3rd button for 3D navigation, but it's a bit redundant if you're pairing the tablet with a Space Mouse.
This guy (who is a digital artist!) has several YouTube videos reviewing various tablets, and showing how to use them. This one reviews the current Intuos small and medium models:
https://www.youtube.com/watch?v=WLclWCHmrjg
I'll try to check back i tomorrow in case you have any other questions.