Your best bet for a good experience in a "Step Up" pen would be this:
https://global.rakuten.com/en/store/hougado/item/platinum-056/
(I managed to snag one in the super broad "C" "Coarse" nib last year, I don't see that option now, these things are also floating around Amazon but prices can fluctuate a lot.)
You can get genuine Japanese gold nibs for very reasonable prices now that global retail is a thing.
Paying a lot of money almost never guarantees a good writing experience but the Japanese are the undisputed kings of quality control. Any gold nib from Platinum, Sailor, or Pilot should hold very similar quality standards.
Even then there are no guarantees, buying online is still a gamble nonetheless, that's the price of skipping the showroom.
(It can be shocking to learn but most of the nib industry still relies on customers to return defective products instead of actually making them all correctly the first time. Among the dozens of pens and nibs I've bought the defect rate is very high, and getting something that writes anywhere near my standards is very rare.)
It's kind of like good drilling in a factory pipe, most of the time if you do find a good result it will have been achieved at random.
If you want to know absolutely for sure that your pen is going to write as well as it possibly can you need to learn to tune it yourself or send it away to a Nibmeister for tuning.
once you know what you're doing it usually only takes a few minutes to align the tines and smooth the tipping but to learn the process yourself will probably mean ruining a few nibs along the way.