Best Remote Administration Tool?

I’m the IT guy at my current company and I’m just wondering what is the best for remote administration. What I would like to do is connect to any PC in the same network range and be able to control the mouse and keyboard from my location to troubleshoot any possible OS problems. All of the end users here are using either Windows XP Home or Windows XP Pro.

I’ve heard of RAdmin, RemotelyAnywhere, TightVNC, etc, but I wanted to hear the opinions of those who have actually had experience using them.

Perhaps why you would choose one over the other? Please let me know, as we’re about to make a large purchase 🙂 Thanks.

-TheC