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If you want something a bit better go for a machine with a rotary rather than a vibration pump
How is it better?
Velocio-
The rorary pump has more consistent and higher pressure, also you can plumb it in.
https://www.wholelattelove.com/blogs/comparisons/vibration-vs-rotary-shots
Having a dual boiler machine is nice but for one or two people using it at home you don't really need it, the second boiler is basically so you can use the steam wand without waiting for the pressure to build back up after pulling a shot or two.
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For my 40th I treated myself to a Lelit Bianca. Slightly over your budget, but it’s absolutely amazing. Manual pressure profiling gives huge control and flexibility, the build quality is sublime. I honestly couldn’t recommend it more highly.
https://www.bellabarista.co.uk/brands/lelit-bianca-dual-boiler-paddle-pl162t.html
Sumo
TTM
If you want something a bit better go for a machine with a rotary rather than a vibration pump, like this
https://www.bellabarista.co.uk/rocket-espresso-giotto-evoluzione-cronometro-r.html