Mobile app design [ONLY design]

We are a known ecommerce and home design site and have already an iphone, ipad, android app but this was designed by a webdesigner who clearly did not harness the power of apps.

We have:
3D room browser, moodboard browser, photo browser, Wishlist browser, social sharing (tw, FB), photo uploader, Login, FB login, push messages for 3D tool

We want to add:
product browser inc categories, shopping cart (with retention of CC and one-click-buy), products used in room. Featured boutiques, boutiques on a map, push messages for "on sale" alerts

Above all: it has to be slick (like houzz,), it has to have a great UI in 4 versions: ipad, iphone, android phone, android tablet

Current Apps:

https://itunes.apple.com/gb/app/mydeco.com/id478304722?mt=8

https://play.google.com/store/apps/details?id=com.mydeco.app&hl=en

https://play.google.com/store/apps/details?id=com.mydeco.app&hl=en