I have an Aramas hunter bridle which I really like. It is a padded monocrown with a wide noseband but no padding on the brow or noseband (personally I prefer this). Beautiful very dark chocolate color, matched the color of a dark chocolate buffalo devoucoux I tried so I am sure it would match a Voltaire just fine. It’s about $350 including reins. I’ve felt a ton of bridles and am super picky (maybe a little snobbish) about them, and I personally think this bridle has the best leather you can get for the price point. I soaked mine in a bag of oil when I got it to dissolve the wax they use on new bridles and now it is super supple, not plasticky at all. It cleans up really nicely and so far just gets better with use.
My mother has a Pessoa hunter bridle for schooling that is not quite as dark (but could probably be darkened) and is a fully padded monocrown. I think this was around $300? Personally I think it is kind of bulky looking, but again, I don’t like a padded nose/brow. The leather is also really supple and nice, but I’ve seen some inconsistency in the leather on Pessoa bridles. I felt another one where the leather felt kind of plasticky, so I would personally not order online and try to see them in person.
I also had a baby showing in one of the Nunn Finer hunter bridles. It’s also fully padded and a dark chocolate color, really nice English leather. Don’t remember if it is a monocrown and definitely is not a wide noseband, though NF also makes a wide noseband bridle. I think mine was about $350 or so, wide nose was similar in price so I’d imagine the quality is similar? I bought their inexpensive $160 bridle when the baby was ready to start under saddle, thinking it would be a nice schooling bridle and the leather on that was awful, very plastic like. I kept it and it never got any better with care/use, finally I just ended up replacing it with something nicer (and more $).
Personally I did not like any of the Red Barn bridles. I thought the leather was kind of plasticky like for the $$, but I am pretty picky and hard to please.
I hope you find something!