music store where bands sign up so they can create a small profile or enter info, decide on what price they want to sell their product, maybe upload images and audio

Customer said he is looking at setting up an online store. But he need is a members only area. Basically it will be a music store where bands sign up so they can create a small profile or enter info, decide on what price they want to sell their product, maybe upload images and audio, tell me how they want to receive payment for their product, change details at anytime and probably some other stuff. We can do most of the customisation after the shop has been setup. I would create the shop and link to the members only area from that. Quotes can be above $250 as budget has not been decided. I could use something like zencart with multiple admins mod, but I don’t know how good that is for creating profile pages for admins or how user friendly it is for uploading music. Customer said he is looking at setting up an online store using the Shop Factory software. He downloaded the trial and it does everything I want. But I ignored and did not look at the script as I just assumed it would be hard to customize in the way he wanted. Preference will go to those who can do this by customising a pre existing script.