Go big or stay home:
Supernova E3. Standlight circuit included.
I've got a B&M Lumotec that doesn't suck as far as dynamo LEDs go, but if I were to start a setup from scratch, this headlight would be part of it.
They have a conventional round beam or one with a horizontal cutoff that they call "asymmetrical". Beam shots here:
http://www.supernova-lights.com/en/e3_comparison.html