every "better" led headlamp will easily outperform the (imho bad) halogen/led Myos.
To stay with the same batts and size:
* Priceton Tech Apex ...probably the best of the breed
* Silva led headlamps ...somehow almost comparable to Apex
other batts:
smaller --> Princeton tech EOS ... best 3 AAA headlamp
small --> Streamlight Argo HP (can run on rechargeable 17650 Li-Ion cell)
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unfortunately there is no headlamp that is really to recommend, I dont know one.
I find the level choice of the Apex silly (runtime/output-wise), the EOS has too small batts,
the perfect light were one sized between Apex and EOS, with the battery carrier of the Apex, three levels (runtime: 3, 7-10, 30-50 hours) and featuring the better emitters already.
Because in the moment You have the mod most any headlight with a Cree/Seoul because they all still feature Luxeons.
PS: the newer Petzls are ok.
More a kind of direct drive output (dimishing brightness with increasing runtime), but thats only important for us geeks.