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The E2 is cheap if you can live with blue casing.
https://www.bike-discount.de/en/supernova-e3-pro-2-6v-dynamo-headlight-1The upside down E3 looks good too and both are road legal.
But I think you would need to choose either road legal or off-road capability.Combination of helmet light and dyno seems like the best option.
edit: the site you linked also have the E3 "Frontscheinwerfer" for €94 in color, actually tempting.
It seems the off-road gains of the E3 Triple come at quite a cost though? It's not road-legal here in Germany, which I could live with if it was suitable for road riding but from what I read its beam is so high that it blinds oncoming drivers? I wouldn't want to have a light I'd constantly have to rotate up and down.