Hi Graham,
I use a Jobo processor (CPP-2) for B&W, C41, and E6 (6 bath) processing, and find it quite a relaxing way to do my processing. It is fitted with a lift, which makes filling, and emptying a doddle. With this I process 35mm, 120, and 4x5 film in film tanks (actually a mixture of film and print tanks), and 5x7 in print tanks. If you did go with a Jobo system, which drums to buy would depend very much on which formats/paper sizes you want to process.
I rarely process paper using the Jobo, normally only doing 16x20 this way (I am a bit restricted for tray space at the moment), but I have a drying cabinet where I can quickly dry drums, though (thanks to digital) I have picked up a lot of drums for very reasonable prices second-hand.
One issue with processing sheet film in print tanks, is the possibility of getting hot streaks due to bromide drag. I have never encountered this, but have started adding a manual agitation step every couple of minutes. To do this I stop the rotation, take the drum off, and give one rotation whilst rocking the drum gently end-to-end. As I say, I never had this problem before I started doing the manual intervention, but I would rather do a little more work, and get good negatives every time.