Just some tips
Hi, and welcome to the boards. I got a little worried when you said you were looking for fully restored, like new condition machines. Here's some tips...
1. You should definitely have some machines in mind and find out as much as you can about them. It's sort of like buying a car... the more you know, the less chance you'll have getting ripped off. If necessary, ask some of the senior guys here look out for good machines for you.
2. Patience. the type of games you're looking for only come around once in a while. I can't stress that enough. It's easy to fill your game room with expensive crap. If you want a nice collection, it takes time.
3. I'd expect a "Fully Restored" machine to have *several hundred* hours put into it (electronics, part sourcing, cab restoration, stencils/art). Most people who do that quality work don't do it to sell them. Many people who "fix to sell" will get it working and make it look nice, but that's it -- otherwise they'd lose money.
4. Even if you found a "new in the box" arcade machine (as some people I know have), it will break. these parts are 30 years old, and they will break. Hopefully you're up for learning how to fix these things.
I'm not bad mouthing anyone who sells machines. It is almost impossible to make money restoring these machines for sale. It's a lot of work, and a lot of time. A lot of the people who do work for other members here barely break even, and I appreciate their help.
So before I go...
Patience, and ask the senior folks here for help. They're an invaluable resource.
Good Luck!