Hello Edmond,
You have posted very interesting project, and I would like to help you with it. I am specialized in interface design, creating mockups and wireframes. Over past 7 years I have worked on various projects, from simple websites to complex CRM system, and now I am focused on web and mobile apps...
Latest iOS project you can see in my portfolio, it is an real estate app. For this particular project, I was in charge for creating wireframes, and after wireframe was approved, I did whole app design (I did retina design too).
Also, I did UI for android game, a week ago...It my personal project and I am planing to relese game in a 2-3 weeks. If you are curious how it looks please contact me.
Price for complete design and wireframe $425, project can be completed in 5 working days. You'll get PSD files for regular and retina screens. If app is for android platform, for this price you can get only 3 different screen resolutions.
I am more focused on UI designing, but I can help you with logo design too.
2 logo concept it will cost you additional $350 it can be completed in 6-7 days!
For communication we can use: skype, viber, email...whatever suits you.
If you want to see web apps that I did, please contact me. So once again, thanks for posting such interesting project and I hope you'll get back to me any time soon.
Enjoy,
Bojan