Not a gold nib but exceptionally smooth, wet, doesn't evaporate, can be had for way less, and has a timeless design (I have a particular aversion to gold and a ball on clips): Lamy Studio; I got it for $40, used, in Imperial Blue, you could go for stainless steel if the grip is an issue, which hasn't been for me, except the feeling of metal (or chrome?) on a cold day. It's the same nib as in lesser Safaris but is way smoother, it's said to be tuned at the factory and I believe it, none of my 7 Vistas even approach it, it's on par with my Sailor Pro Gear 21k, Pelikan M600 and Parker Sonnets (different feel to all of them). Another super smooth steel option, if hard as a nail, is the Faber Castell Ambition, for instance in pearwood.
If you need gold at all costs the Platinum Century starts at about $60 in black and gold, twice that for rhodium; haven't tried it myself; there's also the Sailor Promenade.
Thanks for the suggestion. I'm not looking for gold nibs exclusively, but I figured steel wouldn't be as flexible. I mean, there are steel flex nibs, but you usually have to exert a lot of pressure to use them. I'm interested in the semi-flex nibs only because it might lead to a smoother writing experience by absorbing some of the pressure I put on the nib. As for the Lamy nibs, I really hate the safari nibs. They are dry and inconsistent. I understand that tuning them would make it a lot smoother, but it's still rigid, right? I already have faber castell loom, which has a rigid steel nib that is very smooth and moderately wet.