i'm currently searching for a way to monitor my web application so that I could make a baseline for server capacity plan for the future based on this information.

Is there a way to get the number of hits, unique users, active users, total bytes request(bytes/sec).Is there a tool i can use.or should i develop my own app for this.?

Please give advice what i really wanted to achieve right now is to monitor
the server usage and web traffic.

with local intranet 10mbps connection and
thru leased lined using 1mbps connection.

TIA