Never met anyone who in hindsight regretted their expenditure on a good dyno-hub lighting setup.
I use a Son28 with Edelux and Philips Lumiring tail-light.
Used with an Ewerk with cache battery it keeps my Garmin and phone charged.

As to your quandary about mounting your light, let me know what you think of this:
Custom Light Bracket Schmidt Edelux B M CYO Nitto M12 | eBay

(I'm in no way associated with the company or their products but merely considering one for my own front rack albeit a Velo Orange Pass Hunter rack on my Ogre)