oscommerce web site

I would like a web site for selling T-shirts with different bowling designs on them, and also custom photo products. I would like it to be with open source shopping cart, unless you have a better suggestion, something that loads fast, and is easy to administer. If you have any Mambo experience please let me know about it. I'm also working on an online bowling magazine using Mambo, and I will be looking for someone to work on this project when the oscommerce project is complete.