I'm sure that the Jobo and other types of automated processors are more convenient, but you really need to ask yourself how much use the thing is going to get. If you are doing several rolls a day, or even each week, then yes I'd say it's worth it. Otherwise, you can do well with a plain old water bath and a tempering bath. I've done lots of E6 with a set up very similar to the one Nick described, though I've found the fish tank heater a bit too slow. C-41 shouldn't be all that different, but that 3.5 minutefirst developer time is very short.