I run Lumenmax Elites and love them. I've run lumenarc's and lumenbrites. Overall the performance if very comparable to the lumenarcs, however the footprint of the reflector is smaller. PAR is excellent and the spread is very impressive.
As far as bulbs, honestly, it really comes down to personal preference. I love the look of the radiums but have always been concerned about the lifespan of a 20k bulb as most tend to shift at the 8-10month mark vs 12month for lower spectrum bulbs. Again this is speculation on my part.
I run the Phoenix 14K's on my tank. I've always been happy with the output and color and they seem to last a long time. However, you know what they say about opinions....