Web site software

Hi all,*
*Can someone recommend a web site software that has drop down menus. I've been looking at sandvox and was told it doesn't have them. Basically it's going to be site that you can order product from and you can chose what colors you want. I was refered to fusion but thats PC only. Here is the list of stuff is needed for my site

1. Drop down menus
2. Shopping cart
3. Linked to paypal address
4. Upload pictures of product
5. Mac supported

Granted this is to be my first web site I created so please respond if you can help that would be great. I already registered the domain name of the site I just need a little help in choosing the correct software.