If youre even thinking of putting it in an espresso bar, you NEED a rotary pump. Your customers will flee if they hear a vibe pump!
Id get something with a thermosiphon or saturated group head ... which means that Id be avoiding the Astoria.
When it comes to 2nd hand machines, its caveat emptor all the way. If I were putting a machine in an espresso bar, Id damned well want to know that there was someone I could call if - when - something goes wrong with it.
Best of luck,