WordPress is not just popular for its plugins, there’re also thousands of themes available for it.
And when you are selecting themes, you want a premium theme that will help you stand out from the crowd and one that’s regularly updated such that all security holes that a potential hacker may want to exploit are sealed in a timely manner.
Of course, there are many free themes that you can use if you are on a budget. However, they come with issues. They are poorly designed, not regularly updated, often lack of support and might end up being abandoned altogether!
On my websites, I've used the Genesis Framework.
I love it because, for one, it’s highly customizable and easy to use.
Secondly, it has built-in SEO. What this means is that once you install it, your blog can rank higher in Google search results.
Thirdly, it is highly-secure. The senior WordPress developer (Mark Jaquith) who improved it considers its security as the best of its class.
Fourthly, you can update to a new version of WordPress without losing any of your customizations.
The icing on the cake, especially if you run or plan to run multiple blogs, is that with a one-time payment, you can use it for all blogs under your name.
In general, I consider StudioPress as the best place to buy themes. I absolutely love their support and their themes designs.