To be honest, your men's chorus can sing any song that's out there that's geared towards mass choirs, groups, ect., you've just got to arrange the voices to fit the men's voices. If you still want material that's been recorded for men's chorus try a few of these artists (there's more but these are a good start):
* Lee Williams & The Spiritual QC's
* Keith "Wonderboy" Johnson & The Spiritual Voices
* The Williams Borthers
* The Jackson Southernaires
* The Mighty Clouds of Joy
* The Andrew Borthers
* The Bonner Brothers
* The Canton Spirituals
* GMWA Men's Chorus/ GMWA Men of Promise