Here is talk about best theme in Magento 2015.
1. Mango | Responsive Magento Theme
Mango is fully responsive theme of magento. In this theme have 20 different skin click here to check.
Mango provide different category like Sidebar, Parallax, Fullscreen etc.
Price: $89
2. Granada - Responsive Magento Theme
Granada is fully mobile friendly theme. There are six layouts available in Granada.
Have many features:---
- Easy Install Sample Data
- Fluid Product Grid 2 – 6 Columns
- Unlimited Header Types
- Super Fast Magento Theme
- Various Category Banners
- Banner Slider in Category Page
- Lots of Userful Custom Blocks
- 6 Homepage Layouts
Price: $89