Ask HN: Best e-commerce solution for an online record label?

I've been asked to help put together an e-commerce store for an online music label. They are popular within a niche genre and those who know them are likely to visit their site so providing sales directly from it seems wise. In return for my efforts they are willing to offer me a cut of their profits.

Having done a bit of research my options seem to be:

- Write a site from scratch using Codeigniter - Use Joomla + Virtuemart (open source) - X-Cart (a framework with licensing charges of around 200 dollars a year) - Try to find an existing solution from the 100s of hosted services (most of which seem unreasonably expensive and inflexible)

Although I'm fairly comfortable with writing my own simple projects with codeigniter I'm daunted by the task of writing a full ecommerce solution with payment facilities, security issues, etc. I have no prior experience and I feel that the time spent learning how to put a solution together might be better spent concentrating on the business side.

What's best for me? Are there alternative options I've missed?