I'd like to know the overall characteristics of your app; it is impossible to make a bid without knowng them. I would suggest to develop it with the Titanium Appcelerator platform (that I know very well) so that you get an app compatible with both iOs and Android for the cost of one.
My experience: 30+ years in IT, programming with XCode for iOs since 2008, with Titanium Appcelerator for iOs and Android since 2012.
Anyhow, the important thing is to have an idea about how complex is the thing you designed.