ecommerce for jewelry site

I have an existing jewelry site to which i am looking to add an ecommerce engine. The site has been built mostly in flash thus far but i think that i would prefer to avoid working in flash for the ecomm portion of the site. I am open to your suggestions on what is currently a good choice for ecommerce engines, preferably open source, but once again open to suggestions. this will be for about 30 products initially but i would like to have the ability to add/edit more products as well as change prices, shipping etc. please sent your estimate for a job on this nature as well as any links to work that you have done on other ecomm sites. i would be happy to answer any questions that you may have. thank you very much