ATI and KZ make the best bulbs hands down.
It comes down to preference to an extent, but par values are important too. Actinics have almost no par, where as a Blue+ is one of the highest par bulbs they have and has a very similar lumenescent effect of a actinic.
I run an 8 Bulb fixture, with 2 Blue + on a seperate ballast which comes on 2 hours before my other 6 bulbs, and runs two hours longer than the other 6 as well.
The other 6 are two ATI Aquablue Specials, 1 Coral+, 1 Purple+, and one more Blue+
I get about a 12-14k look with these bulbs which is what I'm shooting for. Adding more blue+ bulbs would get you closer to the 20K look, and more ABS's would add a bit more of a yellow spectrum, and the Coral+ and Purple+ adds the purple color.
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