The best races I've seen the last couple years have been the Herald & Review 100 @ Macon(on a Wednesday night, usually right before Sprint Week starts).
The Icebreaker @ Brownstown is usually pretty good.
SprintWeek race @ Brownstown was awesome.
Although I haven't attended the North/South 100 @ Florence, it's on my list.
Of course, the World 100 @ Eldora.
I don't think I've seen a bad midget & micro show @ Belle-Claire Speedway.