There are places where you can just find something on the MLS and have a good rental. Denver's certainly one of them. You want a good deal, you have to work for it. You kick over a lot of stones and kiss a lot of frogs. This business is not terrible complex, but it is hard. Finding a good deal is hard, much harder than just looking on the MLS.
Forget tax assessments as any sort of indicator of values. Maybe they are, probably they're not.
Many, many areas are over priced as far as rentals. You have to find an area that's not. The houses in my neighborhood are very similar to the houses in one of my rental areas. All built in the late 40's with similar construction and floor plans. And they rent for about the same. But they're much cheaper in the rental area. Research values in your area and you may find an area that works. I did 30 seconds searching and found a house listed at $99,000 that rentometer says will rent for $1150. Still not a great deal in my book, but closer than these other alternatives. What about Des Moines, Cedar Rapids, Waterloo, or Davenport? Are there areas there that have better rent/price ratios?
Can you find deals that need work? REO's or short sales or other distressed sellers? These turnkey, rent-ready deals may be convenient, but they're rarely a good deal. Some are terrible deals, shoddily fixed up, over priced, over hyped and sold to out of state investors that look at the deals through their local glasses. You're right there. Learn values, research areas and find something that works.
Don't get too hung up on the 2% rule. It works well if rents are around $500. If rents are $1000, you don't have to have such a good ratio to still rake off a profit each month. The 50% rule, OTOH, seems pretty solid. That simply states that expenses, vacancy and capital will eat 50% of the gross scheduled rents. Of course any particular property in any particular year may vary quite a bit, especially on the bad side. And if you're doing the property management yourself, you can earn the PM's chunk, with is 10-15% out of that 50%. In other words, if you manage yourself and do a good job and don't count your own time, then you should be able to hold actual expenses, capital (e.g., roofs or furnaces), and vacancy to 35-40%. If you goal is to "buy a job" for your wife, that may make sense.