The above post from ek9vboi and his recommendation of 2 Blue Bulbs, a white, and a purple are probably the best for color/growth and is the most popular 4 bulb combo.
Actinic bulbs Provide extra floresence in your colors but very low par. What you want is a mixture of spectrums especially high in the blue end.
Your 10k bulbs are white, and with your actinics your tank will look pretty much on the purple/pink side. You will see by using different color bulbs your tank will look visually pleasing as well as providing the proper light/spectrum.
I use all ATI Bulbs in my fixture, I will recommend the same as what ek9vboi mentioned.
2 ATI Blue + Bulbs
1 ATI Aqua Blue Special
1 ATI Purple Plus
Another combo which i now like in a 4 bulb setup are 2x ATI Blue +'s, and 2X ATI Coral Plus's. This will lessen the Purple look from the stand alone Purple +, and brighten it up some. It will still be blue, as the coral plus bulbs are 50% blue, 40% white and 10% purple.
Hopfully your LFS are better then mine in most of the area, as few of the ones I went to didnt even know what an ATI t5 bulb was

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