Well thank you all for all of your wonderful input, first day posting on this site and already learning lots.
To answer some questions that came up in responses, first of all, no I do not pay for any utilities or services, the tenets pay for all of that. Secondly I do understand the need for repairs and vacancy, and while I will address that in a minute, I do realize that most of my $245 above my payment will go towards repairs and vacancies (at least until the PMI falls off) and I am not paying anyone to manage my property, I manage it myself.
Now I might be way off base in saying this, as I know that a lot of you have been doing this for a long time. But as i mentioned, above I charge much less than "market value" rent for my property, and by doing so I get to be very picky in who I rent to, and again look for people who are going to be good renters, pay on time take care of the property, and stay for a long period of time. This also makes it "more expensive" for my current tenets to move, and therefore are more likely to continue to rent from me. Because of this management style, or perhaps my naivety, I find a 10% vacancy rate to be a little much. I sure wouldn't want to pay a management company to manage my property if they could only rent it 9 out of 10 months. Also, since tenets wont be moving out every year, there is less wear and tear on the house due to moving, and expenses like cleaning or replacing carpet, and paint only come around every few years. Now obviously things like A/C units and water heaters cannot be avoided and need to be replaced, but I do believe that this style of management cuts down slightly on repair costs, and I am somewhat handy and try to repair things myself first before hiring anyone.
Anyways thanks a lot everyone for your input i will definitely take all that i have learned into account when I'm doing my next deal.