Built a Mp3 Online Store (reedesign)

I'm hiring a developer with expert experience to build a Mp3-Sales store. Examples of stores i would like function like, NOT LOOK: crooklynclan dot net crack4djs dot com yourremix dot com theremixclub dot com Build a Mp3 store (existing database from the old store) and incorporating the functionality of crooklynclan dot net or one of the other with some more functions.. One of the important things are, that dj's can easy reg. and upload there mp3 files….seo friendly, site must run on iPad (maybe later build also a app).. All the features must be integrated into the admin panel, I will provide the graphics, existing database and other necessary files. I want to give this project only to someone who is well experienced with stores and can provide us support in future. Please tell me in your bid what platform you would build the mp3 store and show some examples. (if you don't have build a store, don#t bid here)