Setting up shipping tables

[eluser]megabyte[/eluser]
So I am looking for advice, a point in the right direction or a system to use.

I have built several custom shops, but this time the client wants to have shipping set up by:

country

and have prices for calculating by:

amount of order
total weight of order
percentage of order


Now at first glance it seemed like an easy thing to do, but how to organize it is where I am having troubles.


Do I go by country then by (amount. weight, percentage) or the reverse


also, they want to be able to over ride the shipping method on a per user account basis. This is also quite easy, its just planning how to organize the entire thing.

any help would be appreciated.