How much does it cost to have property management company for remote investor?

[Jason Shi]

Hi, I am an remote investor considering buying a property in Pittsburgh, Butler county cranberry twp to be exact, but I am wondering is there any recommendations to management company that have good service but also can leave some profit margin for me :) 

So far I am seeing 10% management and every time find tenants there is one month fee. Plus you have to pay maintenance. That is like ~23% … 

Any suggestions? 
thanks!!!