How to organize my blogs

Hi,

I going through the process of planning the organization of my Multi-site. All of my blogs are all "small business" oriented, and I am hoping to organize them in 2 different ways:

1.) Industry classification/Product classification
2.) Location

For the industry classification, I'm hoping to create 3 levels of categories (Main, sub-category, and Sub-sub-category). Is this possible?

I noticed these 3 plugins:

- Blog Types
- Blogs Directory
- Members Directory

Which of these plugins or combination of them would you suggest I use to best achieve my goals? (so there are no conflicts)

Thanks,
Derek