Chapter 2 of the ultimate beginner's guide has a lot of information about the important calculations. Chapter 5 has quick analysis methods of how to know if it is a good deal.
Things that is seems you have taken into consideration are:
Income
Expenses
Cash flow
Return on Investment (Amount you invested divided by amount you made in a year.)
Some of the rules:
2%rule - The 2% rule states that your monthly rent should be approximately 2% of the purchase price.
50% rule - The 50% rule simply states that 50% of your income will be spent on expenses -- not including the mortgage payment.
@Victoria DeCristoforo I didn't do the calculations myself but I hope that helps. Rent to buy is a good option if you don't have the money for the down payment. If you are trying to determine which is better, you would want to consider the monthly amount you would be paying for a mortgage vs. the monthly amount you would be paying for the rent to own situation because that would eat into your short term profit. Also, calculate the total amount you would pay over the entire course of the loan but I think that would be a lower consideration because you can use the profit you make to pay off the loan/rent to own situation depending on the terms of the agreement.
Does this help?