Any suggestions for Social Media Monitoring Tools?

Most of the sites I’ve come across relate only to Twitter so I’ve been using Google Alerts, Custom Scoop & website analytics to monitor where  we’re mentioned and how people find our website.

Here are a few sites I like:
Trendistic – Twitter tool that allows you to search and track specific keywords, and see trends for them

Tweetbeeps – Keep track of conversations that mention your company, brand, topic. – You can track who has opened your shortened link versus total clicks for all links pointing to the original long URL alerts – Weekly e-report of where your user name appears across more than 200 social media sites. This comes with their service to create profiles on SM sites.

Any thoughts on the following brand monitoring sites if we should need to invest in a more comprehensive tool? Radian6, Scout Labs, Wool Labs/WebDig,Brandwatch