The ZR4 will integrate nicely with the RX65 and is the better performer against the TruSpeed. The M25 is a better performer against the Ultralyte and the PLIII. Either way, those are some hhuuuuuggggee headlights. Whichever you choose of those two, you will need to Veil the front end bigtime to get passable performance.
Without Veil, I would choose the M25. But since you're going to have to Veil the lights anyhow in my opinion, I would choose the ZR4s. If you choose not to use Veil, I think you'd have to step up to the LIs to get passable performance. I have huge headlights like you and Veil made a monster performance difference for my ZR4s. This is my ZR4s without Veil:
YouTube - 9500ci(ZR4s) vs Kustom PLII
This is my ZR4s with Veil:
YouTube - Kustom Pro Laser II vs 9500ci(ZR4s) with Veil G4 Added
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