I used to run this combo when my tank first went up. I selected the GE 65k for growth but found it to be too yellow for my liking.
2 x 24W ATI Blue Plus T5HO
1 x 24W 12000K ATI Aquablue Special T5HO
1 x 24W 6500K GE Starcoat Daylight T5 HO
1 x 24W UVL Super Actinic 420nm
I then quickly changed out the 65k for another Blue Special.
I have been extemely happy with this combo so far. Although, much like yourself Marvin, I am thinking of adding a KZ Fiji purple as I hear that the reds pop and pinks pop more.