I'm happy with my recent switch to Radiums running on M80 ballasts. Many people that use the radiums run them on e-ballasts which makes them look very blue. When fired on an M80, which they were designed for, they are less blue and look more like a true 14k. PAR is great even for a 20k bulb. I've got 250 at the bottom of a 24" deep tank usning LA mini reflectors.
If you're using e-ballasts though, I would consider a Phoenix 14k or the Ushio.