What CMS to choose for shop?

You need to choose a cms/framework on which to do the online shop. Wishes the following:

• php, mysql;
• Simplicity to the hosting or provide a good (adequate and budget) hostingom;
• Free or very cheap. Minisize both financial and time resources welcome;
• The speed settings. So a programmer who knows php could easily understand and create new custom shop website;
• Change the layout of a design. Welcome ready-made templates and the ability to change them.
• Understandable admin panel. To-programmer's demands, which subsequently will be engaged in the shop could easily understand the standard functions magager this store.

Among the many cms ready "shops-in-single-click" it's hard to choose what meets all. Conduct test drives of all available systems is the best option, but there's no time. So I trust Hebraist this choice.