I have more then 8 years of experience in UX Designs basically on Balsamiq and Axure Software. But I will more suggest you to design wireframes in Balsamiq. Comments will be added in your design which will help your designer and develop to work faster.
-> Source Files -> Mobile Screens (3 Screens) in $5. -> BMML, PNG & PDF Format -> Comments where required to understand User Flow to Designer & Developer. -> Unlimited Revisions
For Website: 2 Page = 1 gig order
For Mobile App: 3 Screen = 1 gig order
Weekend Offer: Order me in weekend & you will getextra fast delivery Free.ORDER FAST!!