IMO, you should absolutely get the turbo version if you are intending to fly above 5,000', especially IFR.
The extra thrust and the ability to continue a steady climb to 10,000' are well worth the difference. As for extra maintenance costs, in the ten years I owned a turbo Sara, I had one problem with the wastegate which was solved relatively cheaply by the guys at EGSX. And that problem was almost certainly caused by a lack of use in the early years.