I would suggest 3 or 4 Lumenarc 3 reflectors for the MH. For a nice white color and good PAR you might want to try the 175W 14K Iwasaki. I know you said 150, but if you havent bought anything, the 175's might work well.
In between you can run 4' vho actinics front to back. T5 would also work well here.
Run everything on Ice Cap electronic ballasts.