I particularly like Smart Bear's Blog interface. It's easy to leave a comment, sign up, low barrier of entry to leave a comment, and it's easy for others to chime in on comments. I like the clean basic look, the layout, and the variety of sharing features. I'm going to add a blog section to my site and I'm looking for a platform that will be easy to use like the aforementioned blog above.
In your opinion, what's the best, easiest, and cheapest blog platform similar to the one i've just described?
Wordpress 100%. Plugins take WP to the next level. There is such a dedicated community you can surely find a plugin to take care of all your basic needs - contact form, seo, sitemaps, navigation, social sharing, facebook plugins, bookmarking, CMS, print CSS, etc.
Most people don't associated Wordpress as a Content Management System, but it can also be used as a powerful CMS and/or hybrid blog/website. There are also thousands and thousands of free/paid themes that make customizing, building, and publishing a site super easy. It's based off PHP so if you know a little of that, you'll be able to master the platform.
I design and develop almost exclusively on Wordpress. Take a look at the WP section of my portfolio for an idea of what you can do with Wordpress: http://www.cenerwebdesign.com/portfolio.html
Everyone seems to love Wordpress, but I found it a bit clunky and difficult to use. I would recommend trying Joomla, which is another free Open Source program that some hosts offer as a one-click install. I run my website on Joomla at it's been amazing for me, especially with the search engines. The Joomla site has hundreds of thousands of free plugins that offer tremendous value. Their forums are also mind-blowing as all the members are so tremendously helpful. Good luck!
Smart Bear uses Wordpress and I believe its the most popular platform out there. Most hosting companies offer it as a one click install, and then from there there are thousands of themes and plug ins out there that you can use to customize your blog.
IMO, wordpress seems to fit what you have described.
Easy to use -Wordpress just works. No complicated installation. U just need a php and mysql enabled server which can be installed in any server. Just a side note if you have an existing windows server, you can easily install it using Microsoft platform installer.
Cheapest - it's free and running on php. Which means you were to go with self hosting option, you can get it running in just a few dollars. It can be totally free of charge if u make use of wordpress.com
Best - I cannot say anything is best as things are changing every time. But I heard Microsoft is changing their live spaces to wordpress. So definitely it is a piece of good blogging software.
You may also want to take a look at 8 Free Plugins to Protect Your WordPress Blog from Being Hacked. And also see this question: Current best practices for blogging As a side note, we use Wordpress for our website, and I would highly recommend it.
This is going to depend on whether or not you plan to physically host the blog on your site using on-premise software. Assuming you're not (and why would you): blogger is easier to use than Wordpress, and as far as I can tell, similarly equipped. I've operated blogs on both platforms, and in my mind, blogger is the winner. YMMV.