ISA Server Performance Measure

Hi again!

Anybody know of some performance measuring softwares or tools for ISA server (not the ISA server Performance Monitor)? I want to know how fast does it perform/work? Say, how many web pages can it handle per second? how many files and bytes can be handled per second by the proxy and/or firewall? how fast is it with a certain hardware? how many PCs can be handled by one ISA server? what kind of machine do I need for a certain number of users?, etc.

If you know of some softwares, hardwares, tools, whatever that can do such, please tell me all about them or give me their sites.

Thank you very much in advance.