Yankeeclipper,
The MIAC schools you mentioned are all great schools academically and have good, competitive sports programs as well. Actually, I took many classes at St. John's (science/pre-med) and graduated from its sister school St. Benedict College about 24 years ago. I played 3B for St. Ben's fastpitch team.
Very nice campuses and great places to go to school - that applies to all four that you mentioned. Macalester can be very tough to get into. My niece was not admitted a few years ago in spite of having an ACT score of 29, GPA of 3.8, and the volleyball coach recruiting her. My 06 son who has an ACT of 31 and GPA of 3.9 is considering St. Olaf's, although he will probably end up at a different college due to his choice of music majors.
None of these schools have "slouch" baseball programs, and in fact most of them may have rosters made up of players who were each in the top 1 or 2 on their HS teams. So if playing baseball in college is important to you, you will need to see how you progress with your HS team and then make sure you communicate with the coach at your top choices by Junior year, to see whether you might fit in to their program. Macalester has winter camps every year, and I think St. John's does also - perhaps all 4 schools do. That can be a good chance to see how you compare with other players interested in the school, and even get feedback from the coaches. Augsburg is another good D3 school on par with the 4 you mentioned.
Congratulations on your A average, and keep up the good work!