I've been down this path several times and back.

From lowboys to Viper cabs.....1000 in ones to MAME.

I would seriously have a look at GameMasters 'Hankin style' tabletops.  They are a nice looking unit or alternatively I would go for a genuine Astro City or Namco Exceelena (not chinese knockoffs).

Depending on what games you want?  If its just Galaga + a few others then I would look at a 48 in one, rather than some cheap overseas rubbish motherboard-all-in one...

Or just run MAME yourself.  Easy enough to setup, just get the right stuff to begin with ie ArcadeVGA, J-Pac etc..