Hey Kenny mate,
Sounds like a nice setup to me! Kinda stuff I dream about
The Dats and the PBass are two fish at the very top of my wanted list.
Arrowana's are again nice fish to keep in a monster setup.
If I had the space and the funds, I think I'd go for pretty much the same selection.
6 Dats is a lot though, if it were me I'd have a few less. Maybe 3-4 maximum. Cos all the fish you listed get hugeeeeeeeeeeeeeee
But that's just down to preference