Thank you for your suggestions. I think I'll buy 42008 at least to get some pf and pneumatics.
Also, I don't want to open a new topic (although I doubt such one exists) so I'll ask here:
Which (newer) Technic sets do you think have most interesting building experience/instructions?
For example, I found building 42029 a very satisfying experience. Tthere are many different building techniques, like suspension, the engine, cargo hold, cabin... etc., and you don't immediately see what the model will look like until later in the instructions. You basicly combine more larger parts into one final (and even turning and pressing some parts until it hooks into another part - like when you hook suspension to the diferential). For me this is much more insteresting than straight forward building (something like 42030 has).