Well, in regards to the spectrum alone:
FRONT
ATI Blue Plus
ATI Blus Plus
ATI Blue Plus
ATI Purple Plus
KZ NewGeneration
ATI Blue Plus
ATI Blue Plus
ATI Blue Plus
BACK
I've been testing bulbs for 3 years and I think today this is one of the good combinations for zoas for the 8 bulb T5 fixture. Good PAR!!!
But it is more a personal taste than necessity, specially when you've got enough room above the system and wattage to play with.
There is way too many combinations and different preferences out there for the bulbs.
Same about the fixtures! I still think ATI fixture is one of the best worldwide at the moment.
You'll need to find yours.
Grandis.