Hi,
I'm an experienced developer (more than 15 years) and I've been working on iPhone apps for over two years. I developed many app you'll find on App Store, please take a look to my website for details: www.tapcoder.com.
I'm available to start working on your project right away and you'll always find me connected to gtalk.
Regarding effort required to complete this app, I need more information to give you an accurate estimation.
I can give you references in the US about my work and my experience as an offshore developer. Please PM me.
Regards,
Sebastian