Import script of Product itemsfor Magento

We have the newest Magento version( Version 1.4) as online shop and we need a Magento product import expert - I have approximately 140 product categories and many product items in xls file that need to be setup of Attributs of each category and imported into an existing install. One PRODUCT CATEGORIES is already imported on the website with the products images, categories attributes (Product specifications) and Parameter Filter for cross-referencing. 1 ) Creation a Import script with with atrributes set up on magento "manufacturers, Lead time, technical information etc.."! All Attributs are with product item in xls 2.) Import all Product items via created import script into 150 Categories 3.) Creation of Parameter Filter for cross-referencing based on setup of attributes for each categoryíes Please quote only if you have big experience and how long you will for this project!! I had big issue on the past time with wanna be magento experts, so you will work on your own server NO payment will be made. Please do not bid if this is unacceptable. The full payment will be sent on project completion, when you have show me the import script on your server. If you need more details, please let me know.