Stats for cart

Hi, I want to suggest my idea, that is I'd like to control the amount of money to spend for a cart in this way.
First, I need to set a price for new and used parts for 1 gram, for ex. euro 0,10 for new parts and euro 0,05 for used parts.
Then, in the cart, I'd like to see also what I'm spending for 1 gram of new and used parts, if over (red) or below (green) my settings, if one compensates the other.
This may help me to adjust the order quantity to fall within the limits, also by adding new parts with lowest price.
Can be useful also this stats in each row of the cart.
What do you think?
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