I have 3+ years solid experience in eBook conversion & publishing over MOBI over Amazon Kindle Store and EPUB over Smashwords (a popular distributor for Apple iBookstore, B&N, Kobo, Sony etc). I am able to develop 100% error free EPUB and MOBI format for you.
I have two quick questions for you.
1. Do you want the EPUB to be compatible to all EPUB supported devices (including iPhone, iPad, Nook, Android tablets etc)?
2. Do you want the MOBI to be compatible to all generation Kindle devices and Kindle Apps running over other devices (like iPhone, iPad, Android tablets etc)?
Looking forward to hearing from you soon, if possible!
Best,
Sourabh