Parker 45 vs Parker 51

Wing Sung 601: $15 vac filler, hooded nib, nail of a fine nib. Good sort of re-pop of the classic Parker 51. Holds ink for days. Good build

This pen is really, really disappointing. 1. The nib is cheap and scratchy. Not well made

* Pilot Super 250 (Body Made May 22nd 1964), 14K "Falcon" (made December 1968), quarter-turn switch filler. Even though my Kashmir Doric in the link above was repaired after the barrel cracked in half, I couldn't bring myself to use it again due to fear of fragility even though the repairer reinforced the barrel with a silicone rod. So I got a Pilot Super 250 in trade, which at the time was the first I hear of the model. I've had this pen for **6 years now,** and it's a fun practical user with a semiflex-ish nib that has a good springback feeling

I have no real requirements other than a nice, interesting writing experience (either because it's a flex/stub or because it writes beautifully, like a Parker 51, or whatever other reason), but I admit I'll start balking if the price climbs too high unless there's a good justification - I plan on using this pen, so something like a Namiki is out of the question since I'd be terrified to get those pieces of art dirty or drop it or lose it. I don't know what to choose, though, so I'm going to put it out there for opinions.