Join Date: Sep 2005
Bikes: Windsor Fens, Giant Seek 0 (2014, Alfine 8 + discs)
Mentioned: 6 Post(s)
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The easy way to get the right one is to spend $85 and buy it from geomangear. You'll get it in 2 days instead of 3 weeks that way too.
Anyway, as far as your links:
25149 - no, old style first generation (non waterproof) battery pack.
29489 - same, just has helmet mount.
30864 - same.
44459 - there you go. New pack. Win.
44676 - also a win. Has a different mounting system. Also has a different reflector which may deliver a better beam.
Take your pick of the last two, whichever mounting system you think will work best for you. Some people hate the rubber band mount, I kinda like it, but I'd be tempted by the last one myself.
Either of the last two should be great lights.
Work: the 8 hours that separates bike rides.