Magento Lanyardsrus.com.au

[login to view URL] We need a way to add an option for pantone dyeing of lanyards to lanyards where if the quantity is less than 300 it adds $30.00 to the total where as when i do it now it adds $30.00 to each item as in 100-299x$30.00 which is wrong of course. (minimum order 100) Have tried with attributes but they don't add price, we have also installed a custom options template from [login to view URL] which helps but still makes the product page too long and too complicated. We also need to add an option for selecting up to 4 print colours from a list of 40+ standard colours or entering a specific pantone colour in a text field (the way it is now is to complicated and too long winded for the customers) This needs to add 10cents to each item as it does but only by selecting the button and doesn't still require that they select the colour type it in. We would love it if they select the button then it gives them the two options but can not see how to do that. I have even considered looking for other ecommerce systems that might do the job better, and I am still looking.