Looking for a network analyzer to go with my ProCurve and MSM series AP's

[groque]

Hi all,

What would you guys recommend as the BEST network analyzer for my network.

I am using 2x ProCurve 2910al and 1x MSM323 and 320 AP's.

I use Dynamic VLAN(s) Mac based, user based and web based.

My main goal is to monitor bandwidth usage for all my VLAN(s) and users in my company so I can bill them appropriately.

Since I use dynamic VLAN(s) and some users roam around the office and connect to different ports, a static port traffic grapher might not give me the exact information that I need.

Is there a solution out there so I can monitor b/w based on users or VLAN(s)? I tried programs such as Netflow Analyzer from ManageEngine but I heard good things with in regards to HP IDM.

I appricate any suggestions.

Cheers