I would say Reitz, North, and Memorial are my top 3 contenders. I think Vincennes will be only slightly better, but not quite good enough to take down the big dogs. Especially with the quality of SIAC coaches and now having more film and prep for defending Hunt. I believe they play at Reitz in week 2 so that will be a huge game, and although an early game, we'll find out how much of a contender they may be. To answer your question, I believe Reitz will repeat.
By the way, if you get extra time and are bored, it would be cool to see a projected starters report for each team! Still lots of time to kill before the season starts 🙃