I have used a lot of WordPress products in the last 11 years of using WordPress. Here is a list of products that I vouch for and recommend.
Elegant Themes – http://www.elegantthemes.com
StudioPress – http://www.studiopress.com
WP Zoom – http://www.wpzoom.com
Themify – http://www.themify.me
Sucuri – http://www.sucuri.net
MaxCDN – http://www.maxcdn.com
Event Espresso – http://www.eventespresso.com
Pagely – http://page.ly
SiteGround Web Hosting – http://www.siteground.com
In full disclosure, these are affiliate links and I do receive compensation for driving sales to these companies. If a company is on this list though, it means I recommend and believe in the company