Product Attributes to Product Options

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Hello!
I'm doing some modifications to the osC 2.2 MS2... I'm working on weights (again! :oops: ). So, I've got some attributes and options setup. I have this all working fine, except now I need to calculate the weight. Here's what I've got:

Option: Unit

Option Values:
Quarter Pound (weight: .25)
Half Pound (weight: .5)
Pound (weight: 1).

I've added a new column to Options Values called weight where is holdes the weight  of the correct option value.

Then, I have the attributes setup:
(Product, Lettuce):
Quarter Pound: $5.50
Half Pound: $10.00
Pound: $19.50

On the product view page (catalog, not admin), the user selectes the correct unit.

Now is where I'm getting stuck. I need to modify the shopping cart class to calculate the weight from the selected attribute, [b]not the product its self[/b].
So, I was going to do some selecting from tables in the calculate function... However, I don't really know where to start, and don't know how to get the selcted attribute.

Any Ideas/Pointers?
Thanks, Taj