It's hard to give advice from the US, as your market is so different than ours.
I do have a Pfeil chisel to try and liked it, in the end I decided the Ashley Iles chisels where a better choice for me, here. The differences are subtle and I'm sure either would have been a good choice. Ashley Iles is from the UK and I don't know if they're even an option for you. (Trade within the EU is supposed to be easy, but with UK in this transition period I'm sure it is weird now.)
I have a few Narex chisels and they seem like a great value, but they are very "beefy". The Richter line sounds wonderful in the advertisements, but I haven't seen one and the only online posting I've seen claims some quality problems. (When you don't know the source, it is always hard to know when the problem is the product, the individual sample, or the reviewer. I'd call this an unknown still.)
You say you have "Hidari oire nomi". What's wrong with them? I'm used to Japanese chisel users raving about their choice and I'm surprised you are looking for an alternative. Good luck, happy shopping, (and thanks for letting us help spend your money!
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Oh, PS- I agree with the others that you don't need a full set. 3 or 4 is probably plenty for most folks, though which 3 or 4 depends on your work, work style, and personal preferences. Knowing up front which *you* will use isn't easy to predict. I recently took a handtool class and in it I only used 3, though I'd brought a few more. One was narrow'ish, just small enough to fit in the corners (1/4" or 3/8", I forget), a somewhat wider one for flushing things (5/8" or 3/4"), and a mortise chisel (1/4" since that's what the class required and the only one I brought.) So, two very different style, three total, for a variety of tasks.