HDS Systems
Novatac seem to be dead in the water these days - since they moved their manufacturing offshore, and lost Henry (who went back and restarted HDS/RA lights)
If you want some interesting reading - there is plenty of history out there, the light started as the Arc4+, then the HDS (EDC ultimate and basic models), then Novatac, then back to HDS again.
I haven't owned a HDS light, but the reviews here have been very favorable, my Novatac EDC120P (built in USA when Henry was still with the company) has been a solid reliable light, carried every day for over 5 years (it was replaced about 6 months ago - but still functions, and lives on my nightstand)
My wife's on the other hand started flickering and refusing to switch on after about 6 months, cleaning the contacts was fruitless, as was contacting Novatac's warranty department.
I wouldn't buy a current Novatac, but would quite happily spend the money on a HDS light.