Shipping Advice

[sysyphus]

I'm seeting up a book shop and I'm after advice on which shipping modules would suit me the best.

 

I need a ship by weight module that's a I set at a price per 3 kgs of stock ie: 5 items weigh 4.5kg then 1st 3kgs costs $3.50 then 2nd 3kgs cost $3.50

 

I need a separate module for small items that's calculated on item's ordered ie: $2.50 for each items

 

Any ideas?