% return on down payment on rental property question.

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If you put 50k down on a rental do you aim to get a lets say 10% return on your downpayment in terms of montly/yearly cash flow? I am trying to come up with a figure that is considered good so i can base future purchases on this number.

ie 150k house purchase
50k down
100k mortgage = 6.875 7/1 arm = 650 a month
100 a month for insurance
100 a month for taxes
rents for 1250 - 850expenses = 400 a month cash flow (b4 unforseen expenses)

400 *12 months = 4800 = 9.6% return.

is this a good way of looking at it? I am figuring worst case scenario no equity growth. Just looking to maxmize a percentage of return on my 50k.

thanks.