About your goal...
It used to be mine. And I did it. Excluding Teugelsi (I quit before Toyin started getting his) and Bichir Bichir (which I'll always be looking for).
Why did I quit??
The Ansorgii was sort of like the Holy Grail for me. I got her, and my desire to own them all just flat out died. I was up to 8 tanks, with hours on end piled into cleaning and feeding. I looked into them, and I didn't like all the species. Weeksiis, Retros, Mokes and a few others bored me to death. I'd bought them because "they were on the list", not because I loved them and wanted to keep them and watch them and all that. I was Endli/Lap/Polli/Del hungry, and I didn't have room to get any more fish that I truly enjoyed because my tanks were all full of fish I didn't care about. I started calling them Spacetakers, and realized I wasn't really keeping them for the right reasons. And in doing so, I was doing those fish a disservice. Other people love those species. I just don't. All those fish are gone, my collection broken up... but I have my Endlis, I have my 5 laps, I have my 3 dels, I have my 3 pollis... and I love feeding time again

And I get that satisfaction when I finish WCs that I didn't have before.
So unless you really really enjoy every species, with all their quirks and personalities... consider all that up there ^. Bichirs are expensive, and you don't get nearly what they're worth at trade in time lol
Keeper