[Used Mazzer Mini Electronic](https://www.kleinanzeigen.de/s-anzeige/mazzer-mini-elektronic-b-alu-poliert-silber-elektronisch/3325638904-176-4769) (400 €) plus a new pair of [Mazzer 233M](https://www.stoll-espresso.de/zubehoer-ersatzteile/kaffeemuehlen/mahlscheiben/mazzer-233m-mahlscheiben-mazzer-super-jolly-mazzer-super-jolly-v-pro) (50 €) or [SSP HU](https://brewout.de/products/ssp-mahlscheiben-64mm-hu-high-uniformity-flat-burrs-espresso) (180 €) burrs. This will get you *very* close to perfection—biggest downside being several grams of retention, i.e. the first shot of the day won't be completely freshly ground.
Or simply a [Kingrinder K6](https://www.amazon.de/dp/B0CVSDNQ9H) (100 €).
It‘s more like the Mazzer standard. :) But yes , same burr size as df64.
The SSPs are great, but the 233 burrs are excellent, too. And there‘s nothing wrong with the Mini‘s standard burrs, too—if they‘re in good shape. So I‘d get the grinder first and then go from there.
i have an atom 75 and i love it. better shots than i got from my mazzer mini plus its quieter and much faster. love the setting knob for grind, and the controls.
Your OXO grinder is going to be the bottleneck here, more than the machine as you start to scale up. I started with an old Breville myself and didn't start pulling shots the way I actually wanted them until I upgraded to a good grinder, I splurged and bought a Mini Mazzer grinder - it was a big purchase at the time but I've had mine for 20 years now and it's been flawless through multiple espresso machine upgrades. For your budget, I'd grab the Bambino Plus and put the rest toward a quality grinder like a Eureka Mignon Notte (on a budget) or used Mazzer if you can find one. The grinder is honestly where much of the magic happens, and like buying guitars, once you get the bug you'll keep wanting to upgrade anyway so might as well invest in something that'll last.
Angulon
