Quoted from Coindork:

My advice would be to by one of the reunion cabinets. I.E. Class of 1981 20 year reunion.
It’s an officially licensed machine in a real arcade cabinet that is the same style and dimensions as the original (I believe they still make these). If not, they are not hard to find in really good shape.
Way more reliable PCB and power supply, plus you get a larger sized CRT monitor than the original 19 inch.
Plays both Ms. Pac-Man and Galaga (some board sets also play original Pac-Man).
If your just looking for one machine for your game room, this is the route I would go (unless your dead set on an original).
If you go the original route, try to get a plywood cabinet. The originals come in both plywood and MDF “particleboard”. The MDF cabinets turn to crap if they get wet and may have water damage at the bottom from moping over the years. Those cabinets soak up water like a sponge and the wood turns to oatmeal.

Quoted from PoMC:

Advice for an arcade machine? Probably make sure you really want it. "Classic" arcade games suck so hard. Neat to look at it in a corner and say, "I remember that game!", and as a piece of decorative furniture. But gameplay wise? They suck.