Do you use SE or DE bulbs?

For single ended bulbs, I had good results with Reeflux 12K bulbs. The colors are actually pretty good and it still provides a high enough K to promote better growth than a 20k bulb.

For double ended bulbs (and I have never had an HQI unit) I have had friends who saw good growth and great colors with Phoenix 14k bulbs.

Since you have actinics, you can go with a whiter bulb, I personally wouldn't go with the 10k bulbs. In my experience, they have always been a tad bit too yellow even with actinic supplementation.