Gaggia classic isn’t an e61 though, it just happens to have 58mm grouphead. Nonetheless, I would recommend a Gaggia or a rancilio Silvia over an actual e61, since those are both more expensive and more difficult to maintain (and heat up more quickly).
Honestly, real endgame is anything lever based in my opinion anyway. But that’s just my preference.
Levers can be the ultimate for long lasting as virtually zero parts to wear out especially the ones that require you to heat up the water yourself, but I would struggle to recommend one to someone coming from a bean to cup due to the difficultly factor. My first espresso was a Flair, having to get the temp, speed, and pressure consistent every time for every shot at 6am in the morning was a complete PITA on top of getting the grind, temp, and weight right for that shot. I soon switched to an E61 as its just push button in comparison.
Long term I want a lever like the Strietman CT2 but not till I get a Decent for everyday use.