My HL and TL search is over (for now). I went to a "Perf. Bike" store yesterday and picked up a
Cat Eye HL-EL510 headlight and
NightRider 5.0 TL for < $40 total (after the "457" 15% off coupon). Installing them on my bike was relatively simple, but note that NightRider comes w/ no instructions whatsoever. I'll report back when I do some dusk/night bike riding.