For me, I just used:
1. All-In-One-SEO-Pack commonly used by most internet marketers
2. Akismet Key to weed out spam comments
3. Optimize Press and Affilotheme for my membership, landing page and affiliate review sites although I do occasionally used Woo and other niche-related themes if I can find any online.
4. CK Editor For Wordpress - I do not like WP default editor which does not have the option for you to change your font size and style. So I am looking for something close to MS Office Editor and replaced it.