Like you, I prefer a wide drop bar 46cm or above if possible. So I have done similar searches to you.
First of all, the reason why the Nitto-made Rene Herse bars are so expensive is that they are heat-treated. This means they are very strong but also lighter than bars made by brands like Velo Orange and Soma. The finish is also better than VO or Soma. These are Nitto's top-end products. Nitto's house-branded bars that are heat-treated are similar in pricing.
I have both a Maes Parallel and a Randonneur bar in 46cm from Rene Herse and they are both extremely comfortable and light. I would recommend them. The Randonneur bar doesn't look racy but there is nothing about it that would prevent you from going fast.
I have another Nitto-made heat treated bar under the Crust Bikes brand that 53cm wide, which I also really like. These have a 31.8 center though.