My recommendation is too first think long and hard and come up with a list of games you actually want, then check prices and decide if it's right for you or not. Arcade pcb usage at home is a whole level higher then what a console only gamer is used to. Your average pcb collector will gladly throw $200 on a game without even blinking.
Typically PCB collector's are in it for the "full authentic experience" so to speak. Meaning, you need a quality RGB setup of some kind. Sure you can get a cheapo S-Video or Composite encoder, but in that case, MAME will look better and you will be disappointed. And honestly the monitor is by far the most expensive part of the setup. You might find a cheap local cab, but do not buy one without a good fully working monitor.
Since money can quickly add up, I tend to stick with boards that are not emulated correctly, since there is no other way to play them, as well as some personal favorites. Of course the games that don't work in MAME go for a lot of cash these days...