I would say something close to what JRB states, but I do nto like a tank that is too blue, so I would go with:
ATI Blue + 460
KZ Fiji Purple
ATI True Actinic 420
ATI Aquablue 12k
The blue+ and True actinic will enhance the blues and greens, and the Fiji will enhance the reds, oranges and yellows. The Aquablue will just give it a bit more white balance and you should get about a 14k total color with some good "POP". I try to stay away from 10k bulbs as they tend to wash the color out some.
But, if you like a bluer look, go with what jrb says, and you will still get some good color pop. Both options will work, and it just depends on if you like a blue look or a more light blue look.
My tank has 8 80w T5's as follows, and I get some very good color:
ATI True actinic
12k Aquablue
ATI blue+
KZ Fiji Purple
ATI Blue+
12k Aquablue
ATI True Actinic
12k Aquablue
Hope this helps.