Anyone who owns all 3 of these lights will face something of a dilemma when having to pick one to use - they're all top of their class! I'm one of those lucky ones, I guess
But they all have their particular talents.
I like my X5 for the beam color and incredibly even (practically no hotspot beyond 4 feet!) and large flood up to around 20'. I love my Elite for its dimmability whilst still being able to throw (this thing *has* a small hotspot) and illuminate practically as well as a 7-LED Lightwave3000 when needed. My precious Arc-LS is, by far, the brightest and has the best throw of them all even with old optics, though its color is a little off(violet).
IMHO, the X5 and Elite make better near-range task lights, where an LS is often too intense. The Arc's superior throw immediately puts it in the medium-long range flood category, where it is incredibly impressive and useful.
Having all 3 to choose from at any time for a given task is really quite a nice luxury - I'd recommend owning all 3 to anyone.
If you wanna see pix, try
http://thelightsite.cruxial.com/reviews/shootout/shootout.html
That should give you an idea about all their respective "throws".