12 par 64, 4 trackspots and 3 martins, puts you at 19 intelligent fixtures and 16 conventional fixtures.
It sounds as if you buy the operator, you can get away with using the operator and nsi 6128 and not use the universal controller.
Or if you want to go with one board, you will need the SHOWDESIGNER 3.
If that to big, you may want to consider Compu 1024EC.
Not many consoles offer controll of 16 par cans with moving lights.