It depends on the product, and what your strategy is for selling it. Start with the end in mind.

Get LeadPages, it's $37/month and it'll be flexible enough to build a whole sales funnel for you.

Dear sir,

You did not mention here 2 item..
1. free or paid theme ?
2. Product name.

I have used free theme for my Client's fashion product blog site.
Evolution Business Theme is in my choice list.
Thanks

Hey,

WooThemes Canvas and framework is just great – just like the name implies – it is a blank canvas allowing you to change and design all the elements of the to-be-built website. The built-in theme options are extensive – but they just can’t cover every conceivable tweak.

WooThemes Canvas has a ton of built in shortcode and options, for clients that have CMS requirements we modify or add new shortcodes to the existing options. This list of WooThemes Canvas CSS Tweaks also provides a couple of modifications to existing shortcodes.

Modifications to bullets, boxes etc are all do-able and provide that extra layer of polish to Client CMS website as well as saving a bunch of time.

Here's a good news, there's a separate company that build great plugins and extensions designed for canvas exclusively. Their latest plugin is called Canvas Page Builder. It is a powerful yet simple Page Builder for WooThemes Canvas. Say goodbye to long confusing pages ofshortcodes & unnecessary plugins. Say hello to speed and creativity.

You can check the video here, Unleash your creativity - Pootlepress (not an affiliate link, I just love the builder)

My next favorite framework is Genesis. They have lots of awesome child themes.

More power to you.

That depends a lot ...

For blogs, I suggest Thesis, even if I consider it overpriced.
For sales letters - Optimize Press.
For entire funnels - LeadPages.

There are countless options out there, the only difference is how much bang you get for your money.

You can opt for genesis, thesis or mythemeshop three of them are great and responsive theme providers for WordPress.

I don't know if you're looking for paid or free themes. And are you looking to set up a digital shop or start a blog. BTW, here you will find a list of free magazine style WordPress blogging themes: 10 Responsive and Free WordPress themes

i use thesis from diy themes. ive tried a few and this was the best one for me. it really sped up page load time and is great for seo.

Twentyfourteen and Spacious are the two best themes I have utilized and for product based I would recommend you to go with twentyfourteen. The look and feel is quite awesome.

There are no best themes. But themes best for people. I think you should check other's website. And if you like any theme any website is using. Then you can check the theme by going at www.whatwpthemeisthat (dot) com.