I really, really, really wanted a pin. Didn't want to spend a ton of money, but didn't really like EM's that much, so I assumed I needed something from the DMD era. After stalking craigslist for a few weeks, and realizing that DMDs were out of my price range - there was a really worn out High Speed for sale for cheap. I hemmed and hawed, and when I finally decided to do it, it was gone. A week or so later, another one popped up and I bought it.
I had never played High Speed before, but knew it was well regarded. It was nerve wracking though because it's an older game and wasn't sure if it had enough replay value. But I needed something to have in my house that I could play all the time and build skills on - and so I could stop obsessing about it.
Long story short: I've played over 1200 games on it with no signs of slowing. My advice is that if you can find something for a good price, just buy it. Enjoy pinball at home! Practice skills for free, learn to fix and maintain it. Maybe you'll get tired of it in a few months. Just sell it or trade for something else. Plus, by then, you might have a better idea of what you want. As long as you didn't overpay, you don't have to worry.