Top 5 Free Plugins:
1) All In One WP Security & Firewall: http://wordpress.org/plugins/all-in-one-wp-security-and-firewall/
2) Pretty Link Lite: http://wordpress.org/plugins/pretty-link/
3) Shareaholic: http://wordpress.org/plugins/shareaholic/
4) jcwp youtube channel embed: http://wordpress.org/plugins/jcwp-youtube-channel-embed
5) WooCommerce: http://wordpress.org/plugins/woocommerce/
Top 5 Premium Plugins:
6) InstaBuilder: http://bit.ly/1pscPzI
7) PopUp Domination: http://bit.ly/1mAB4cQ
8) OptinSkin: http://bit.ly/1cP51Tg
9) Lead Rocket: http://bit.ly/1fqtICh
10) Seopressor: http://bit.ly/1evFiMh