Very nice Mike, great colours and you've got plenty of Blue Stragglers there
You're right about M22 being the 3rd brigtest. Here is a list of the ten brightest globulars according to the
Catalog of Parameters for Milky Way Globular Clusters:
NGC 5139 (Omega Cen): 3.68
NGC 104 (47 Tuc): 3.95
NGC 6656 (M22): 5.1
NGC 6752: 5.4
NGC 6121 (M4): 5.63
NGC 5904 (M5): 5.65
NGC 6397: 5.73
NGC 6205 (M13): 5.78
NGC 5272 (M3): 6.19