Best eCommerce Plugins for WordPress

I am curious what wordpress eCommerce plugin either paid or free you would recommend. I have used Cart66Lite, which I really liked but it won’t work for my current client. They need the ability to have several custom drop down menus for (colors, sizes, backgrounds, etc.) and Cart66 only allows for 2 variations. They also need to be able to have a section where the user can enter a custom filed (for monograms, etc). Any suggestions?

Thanks.