Jean-Marie,
The picture you have is an Artisan Easel. They have one at my local art store; the price is $2200. You can see it here:
http://www.meininger.com/store/detail.aspx?ID=83
There is also a non-motorized version for around $1650 that you can see here:
http://www.ospowercart.com/vcom/prod...products_id=27
Not cheap, but very pretty. The one thing I don't care for is that the paint tray is also the lower canvas holder, which means that if you have the bottom of your canvas up around chest high, so is your paint tray, and getting into the solvent canister won't be easy.
I haven't actually tried one, so don't know how easily it all works.