I’ve got a Sks rennkompressor with a low pressure guage fitted in the car for MTB use. Feels like it will last a lifetime. Theres a Lezyne Alloy floor drive in the house with the bikes. Very nice, but suspect it won’t last as long as the SKS. You could probably stretch to two SKS with your budget!
Plus an Airshot for tubeless inflation.
I don’t see the need for a high volume pump – most of the time you’re only adding a few psi so some extra strokes aren’t a big issue.
Guages are only accurate in the middle of their range – the guage on a high pressure pump for road tyres that’s accurate around 100psi won’t be any use for setting MTB pressures accurately.