If your goal is professional flying, than I would absolutely recommend staying out of the G1000 for pretty much all of your pre-CFI ratings. So far only one plane I've flown as a professional pilot was all glass (CJ3), and that was a pretty easy transition when I came over from flying King airs and Navajos. After flying the Citation for several years, I'm back in an analog plane again (Brasilia), and am very fortunate I had a previous background in the analog gauges.

When I was instructing, I had a couple of students that had done their primary and/or instrument training in the G1000s. They wanted to transition over to the analog gauge planes, and it was a freaking mess. Their situation awareness was absolutely awful, and they just never really were comfortable with basic stuff like flying a raw data VOR approach.

Conversely, I did a couple of transitions for guys that had learned in the analogs and wanted to fly the G1000s. They were easy, and most were signed off after the minimum flight times were met.