Thanks for the opinions, everyone! It was a very tough choice, but in the end, I went with The Humans. Just purchased a ticket for that and Blackbird with the help of a Telecharge Gift Card I got for Christmas.
So, it looks like this will be my line up for my Spring Theater Trip...
April 2nd (afternoon) - She Loves Me
April 2nd (evening) - School of Rock
April 3rd (afternoon) - The Humans
April 3rd (evening) - The Father (Haven't purchased this yet, but will soon.)
April 4th (evening) - Shuffle Along
April 5th (evening) - Bright Star (I know this has gotten a very mixed response here, but I've liked what I've seen from video clips of the Kennedy Center production.)
April 6th (afternoon) - Blackbird
April 6th (evening) - Waitress
Thanks again, everyone!