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Hi Bertrand,
First I need to say that you won't make out much, if any detail on Jupiter's moons - they are just too small to make out detail. It would require all your ducks to be sitting in a row, seeing conditions, transperancy, scope & gear quality - and then it would only be subtle tone variations.
You've got a 10" dob already. A 5" to 8" SCT or Mak would be a great compliment. These are fantastic lunar & planetary scopes. They can be mounted on a simple eq fork mount, or go the whole hog if you want to do some serious Astrophotography. An 8" SCT or Mak will show an outrageous amount of detail on the Moon & planets.
I have a few dobs. 3 actually: 8", 10", & 17.5". But for the Moon & planets I always reach for my 30 year old C8. It's on a basic fork mount with only a fixed speed clock drive, but that's all I need. I did have a C5 until recently, but sold it only because the number of scopes I had was getting absurd. The C8 I can also attach an Astro video camera for live images of DSOs, which is great at star parties in urban areas. This is also as far as I take Astrophotography myself.
You can find the simpler fork mounted 5" to 8" SCTs and Maks regularly in the classifieds here in IIS, these cost considerably less than those with sophisticated eq mounts. The 8" models you can also attach a 2" diagonal to.
Mental.
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