I tracked down the coaches salaries. Here are my rankings based on performance and stability.
Izzo - 5.92 million (8.342 million overall?)
Painter - 3.55 million
Holtmann - 3.5 million
Howard - 6 million
McCaffery - 3 million
Underwood - 4.6 million (won a big title)
Gard - 3.55 million (won a big title)
Pikiell - 2.6 million (will bump up a million and more soon)
Willard - 3.9 million (good track record at Seton Hall)
Woodson - 3.125 million
Collins - 3.262 million
Shrewsberry - unknown (rebuilding)
Hoiberg - 3.5 million
Ben Johnson - 1.95 million (started in a bad spot)
Izzo - 5.92 million (8.342 million overall?)
Painter - 3.55 million
Holtmann - 3.5 million
Howard - 6 million
McCaffery - 3 million
Underwood - 4.6 million (won a big title)
Gard - 3.55 million (won a big title)
Pikiell - 2.6 million (will bump up a million and more soon)
Willard - 3.9 million (good track record at Seton Hall)
Woodson - 3.125 million
Collins - 3.262 million
Shrewsberry - unknown (rebuilding)
Hoiberg - 3.5 million
Ben Johnson - 1.95 million (started in a bad spot)