[Architecture] Size your SharePoint 2010 Farm

Design a SharePoint 2010 Architecture from scratch and for a big company could be tricky.
How many frontend servers / applicative servers / query server would I need ?

Some tools exist :

HP Sizer for Microsoft SharePoint 2010

Screenshots :

It is really easy to understand how to use the software, here some screenshots,  :
Your first configure the project and the company type,



Configure the number of users for your SharePoint farm and user requests


Which features will they use the most ?


Which storage ?


And click on finish to see the magic appearing :



It even propose the CPU Type AMD :


Cherry on the cake : the price



Do you know any other tool, to help you to size SharePoint Farm ?