I agree with Jim on the 454 bulb, it's worth the effort to look for one.
Instead of the 2 white act's, I'd do 1 act white and 1 75/25. The 75/25 puts out a little whiter color with just a touch of blue.
I'd avoid the aquasun, never cared for the pink color of that one
On a side note. If you stagger 4' bulbs, you'll be able to get a lot better coverage from (8) 4' bulbs. I like mixing the T12's with T'5s.
You'll have an almost endless supply of color options that way