this is a topic very dear to my heart... sorry i didn't see it sooner.
I've had so many dif soldering irons over the years... but then I bought a hakko fx-888D and I've had that for probably 7 or 8 years now...
It has been absolutely fantastic. gets up to temp in maybe 15 seconds. you can see the temp on the led read0ut. preset temps set in... so switching between 450 and 550 for instance, is as easy as hitting the up button one time. the tips are very available and I've had the same tip on there for probably 2 years. it was a tip I put on to do smd components, very fine tip, just haven't bothered changing it as it works for everything I do. I keep closing a drawer and catching the cord for the pencil... which is replaceable... but it just keeps working.
for me... doing a pot is easy peasy. turn the temp to 550, clean/scratch up the pot where I want to solder, touch the tip to the pot for maybe 5 seconds and then touch the solder to the area to be soldered. have done that on everything from alpha to cts to bourns... no problem.
afa best solder... bought a big spindle of kester .031" solder about 2 years ago and I'm not even 1/4 way through. I solder fx pedals, guitar setups, and other odds/ends. it's the best I've found.
all that said... I bought a cheap iron to keep in my garage. off amazon... primarily use it to back out dents in wood... but I used it to solder up my speaker cabs when I built them and it worked great. was $25. temp controlled (dial) iron. the issue with these cheap irons is the tips do not last and you can't buy replacement tips (that work well) anywhere so when the tip(s) wear(s) out you are buying a new iron.
https://www.amazon.com/Hakko-FX888D-23BY-Digital-Soldering-Station/dp/B00ANZRT4M/ref=sr_1_2?crid=M4XNQ75N1HKT&keywords=hakko+fx-888d&qid=1658237325&s=industrial&sprefix=hakko+fx-888d%2Cindustrial%2C120&sr=1-2
https://www.amazon.com/Kester-24-6337-8800-Activated-Solder-No-Clean/dp/B00068IJOU/ref=pd_lpo_1?pd_rd_i=B00068IJOU&psc=1