Data Import Advise & Suggestions Required Please

Hello,

I am in the process of preparing to import data into Drupal and would like to hear some suggestions on the best method to do so. The tricky part is the relationship between nodes as the same node can be in multiple categories.

For example:
A carrot (node) can be in the category of Food AND Vegetables AND Snacks etc.

Furthermore, there are multiple levels of categories within categories. For example:

Food
-- Vegetables
-- Snacks
-- Fruit

Snacks
-- Vegetables
-- Fruit

Fruit
-- Snack

My current plan is as follows.
1) Use Content Construction Kit (CCK) or Flexinode to create a node type of Food with related fields. (CCK vs Flexinode, what is recommended?)
2) Use the Node_Import module http://drupalmodules.com/module/node-import to import the data
3) Use Node-Relativity http://drupalmodules.com/module/node-relativity to establish the relationships between the nodes, but I am not sure if this is suitable?

I would very much appreciate hearing some recommendations.

Many thanks!