Thank you everybody! I haven't found anything wrong with them so far, so score! On to the questions...
Tynstar - No, that's my girlfriends mothers garage. My girlfriend and I will be buying our first house in a month or two, so I'm just storing them there for now. And yes, it is pretty damn messy. It was like playing Tetris trying to get those in there. |D
Den - I sure did go to the auction on Saturday.
Next time it's in town, you should come too. I thought everything would be well out of my price range, but a lot of the machines went damn cheap. The Dig Dug I got for $250 and the POW I got for $150. I could have got a Circus for $45, but I had already spent too much at that point. Besides the coin slot didn't work which meant that I couldn't play it until I fixed it, so I just let it go.
Speedy - These weren't exactly my favorites growing up, but they were right up there. Before I went, I decided I wanted an older (pre-crash) machine and a neo-classic machine. Dig Dug is in the Holy Trinity with Galaga and Pac-Man for me, and I've just always had a blast playing POW. If they would have had both, I would have rather bought Galaga and Double Dragon, but the copies they did have there were either 100% non functional (Galaga) or just in generally bad shape (Double Dragon).
I may also be able to buy a Centipede stand up soon, so stay tuned.