Where the money should go
The single most common mistake is a $700 machine paired with a $60 blade grinder. Espresso is a pressure-and-particle problem: if the grind is inconsistent, no pump or PID controller can rescue the shot. A $200 burr grinder plus a $300 machine will out-drink a $900 machine paired with a blade grinder, every time.
The order that works
Buy the grinder first. Then the machine. Then, and only then, the accessories โ and among those, a scale that reads to 0.1 g matters more than a bottomless portafilter, because dosing is the variable you can actually control.
What you can safely skip
Pressure gauges on entry-level machines, "professional" tamper mats, and most cleaning kits are upsells. A dedicated knock box is genuinely useful. A milk pitcher you can skip only if you never steam.
Picks
Entry burr grinder
The highest-leverage purchase in the whole setup. Change this one first and everything downstream improves.
If the budget only stretches to one upgrade, it is this one.
Awaiting ASIN0.1 g dosing scale
Cheap, unglamorous, and the single biggest consistency win once the grinder is sorted.
Awaiting ASIN