I saw the Brinkmann headlight and it appears to be an adaptation of the "Longlife" made into a headlight. I also saw the Ion, and as mentioned, it uses an odd battery - a CR2, if memory serves me correctly.
In the given price range, I'd think the PT Aurora would likely be a better choice.
Let me qualify my statments, by pointing out that I have not seen the beam from either of these 2 headlight mentioned here, but I do own an Aurora.