Please explain. I haven't kept up with the trends in flashlights for a few years......
Arc is gone, essentially. The only thing they make now is the Arc AAA, which is a shadow of its former self. That being said, it should be feasible to refit the Arc LS with a GDuP three-mode driver and a nice Cree XP-G or XM-L (the latter being much larger and floodier).
If you want something newer, consider a nice Jetbeam TC-R1. Those are new, made of titanium, have an infinitely-variable brightness control that goes from barely-visible-in-pitch-darkness up to ~500 lumens. There's a thread discussing them right now. They cost about $160-180.