If you want to stay within the PR sized drop-in, kind of, the Mag LED bulb is probably the best for the Mags. It runs as hot as you dare without an additional heat sinking path, and on extended runs will reduce current via a thermal management function to protect the unit. It is actually a bit bigger than a real PR, and so won't fit many other lights than the Mags. If you want the max. brightness from it, a Seoul LED can fairly easily be substituted for the Luxeon, doubling the output with no loss of runtime.
I have used the Dorcys (and the same bulb sold at Sears) with a Seoul mod, which is even easier than modding the Mag bulb. It is again not a barn burner, but can't be with no place to move heat to. But it works on a wide range of cells, 1.5 to 8 volts, and tends to make a very nice beam. The stock Lux on all of mine has always been a very nice warm tint, although YMMV. From other's comments, the Nite-Ize 1W achieves pretty much the same thing. But looking at them, it does not appear to be a Luxeon emitter, and I can make no comment on the feasability of an emitter upgrade for this one. I appears to be the same as the Terralux TLE-1F.