Hi Cory,
I think if you don't worry about the rules so much and keep putting aside money to put as your down payment, you will eventually get to the point where it would make more sense to just buy a unit than to sit on your money. The problem with following a rule is that it holds you back from just finding a good deal and getting into the market. As with most of the deals mentioned by the others, the earlier they got into the market, the more they could benefit from the appreciation (and experience).
With my first unit, I didn't follow any 1% rules. I just made sure I found a solid rental unit in a good location that could cash flow after all expenses were paid. Two years later, I have no regrets. The unit has gone from $262K to almost $400K now, it cashflows more than it did before, I have a great stable tenant, and that unit has given me leverage to buy more units. It was a great experience and it launched me into more purchases, new contacts, etc.
I can't remember where I heard it, but someone that was successful in REI said that finding and buying great deals is really good, but that if you simply buy and hold for a long time, all deals will eventually be great deals. If that's the case, you should simply keep running numbers and buy your first unit based on numbers that make sense for you even if it doesn't quite fit the 1% rule.
Good luck!
Marie