[CH]

I have 3 bulbs, one of each type and I'm ok with the color. It's a bit pink, so it could stand to use one more actinic. So, with 4 bulbs, I would do 2 blue actinics, and 1 of each of the aquasun and white actinic. Put each of the blue actinic on the outside of the configuration (for example, blue, aquasun, white, blue)
You can also play around with the order in which you put them and you will get slightly different looks.

As far as T5 vs VHO, you already have the VHO set up, stick with it. It only cost $100 every couple of years for 4 new bulbs (yes I go about 18-24 months on my VHO's) Plus, there is not much that you can't keep under them. I have everything from mushrooms and anthelia to LPS (Caulastrea & Plerogyra), to SPS (montipora & Acropora) They may not be as super bright and colorful as they are under halides, but they do have color and they grow very rapidly.