I am someone who was in you position, I am technical but not a developer so I needed to find someone/company who could build what I needed and wanted.
I went to freelancer and odesk as well as tried to hire local. I also tried to find a partner.
I had terrible experience overseas as well as local.

Connect with your local tech startup group and see if they offer some services or have a company who they have used in the past.
I can tell you that just because someone in India, China, South America is cheaper then local does not mean it's the best decision.
Spend a little more if you need to.
Have your dev done within or close to the same timezone. You will save yourself from staying up until 3am to have meetings.

You can shoot me a msg if you have other questions.