Where do i find???

Maybe it cannot be tweaked - but can anyone point me to the file responsible for generating the product attribute output display for radio buttons and dropdown lists?

I'd like to see if i can massage the display from the standard:
larger ( +$15.00 ) (+0.6lbs)

to something cleaner and simpler in appearance, like:
larger: $15.00

I'm hoping to add a simple conditional that tests if the product has an assigned base price and if not (or if it is $0) then use the cleaner (and less confusing to the customer) display. I just cannot seem to locate where or in what file/s this output is generated. Anyone have a clue where?

See includes\modules\attributes.php line 144. I think it is what you're searching for.

If not, try searching for "TEXT_PRODUCT_WEIGHT_UNIT" constant. It is your "lbs" - seems the only string is not generated from database.