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