Buying a 156 2.0 or 1.8??

Hello! I’m thinking if I can get an Alfa! The problem is only I have no experience. I was told that the cars are zimlcih susceptible to the engine and something like that. My questions are now: – Do you have to invest a lot in an Alfa? – Which engine is better? 1.8 2.0 or which one? – How about the consumption? is there a approximate list somewhere? Would be nice of you if I were helped. Thank you