I'm using THESIS. Thesis is the best so far for me. Very customizable and SEO friendly. Here are some thesis examples: http://www.artofblog.com/thesis-design-customizations/
Everyone's going crazy over Thesis, but I've found Atomic Blogging to be far more customizable plus it costs less
I am using inFocus. I like it because I can use it to create what appears to be a normal website. I also use the same platform on the same site for blogging. I have not found anything like it anywhere else. Wordpress was never really meant for normal websites, but with the right theme and a few anxiety attacks, you will get it right.
I choose those which are beste sellers, so most people like them, probably stay a bit longer on your site, so you sell more????