I am on a hunt for this too. I have seen a lot of composers using a BCF 2000. Its not made any more but available for £120 on ebay UK. I bought one, but so far I have not plugged it in. Since buying it, I found a thread (GOD knows where that is now!) that says it only works with MIDI tracks, not instrument tracks. This is worrying. I would say I would let you know but I could never find your thread again on this forum.
I have had a lot of trouble with controllers in general. Offerings from Akai , NI, Korg, Nektar have all been a pain to set up, the software is often dodgy and does not do what it says on the box, or the box does NOT say what it does not do. The Akai and the Nektar failed to work even after tech support. The whole area is a minefield - mostly because of the connection issues. A lot of stuff has poor build quality too, so beware of pretty pictures.
I suppose the current hot product for this is the Fader port range. If you are doing things like orchestral mock ups you will need a minimum of two faders - CC1, CC11 but four would be better. This means a fader port eight as they dont make a fader port 4.
I have not seen one in real life and I would recommend you do. If your local music store can see one. Whatever you do, buy from a store that gives ano quibble returns. Also when you narrow down your search, check to find other users of Cubase that use the same device for CC controlling. That’s important, it must work with Cubase (forget the hype on the box) and it must be able to control CC, not just thing like record enable, faders etc.
Take a look here: Digital village, nee Musicstore is a very good company. Support for me has been rock solid for 30 years.
Type in the search motorised faders