Magento 415 configurable products - need to add all simple products with pricing

Hello and thank you for reading. We currently have an ecommerce store using oscommerce. We are in the process of switching to magento. We have all configurable products imported but they need to have their simple products added to them and this will take some work/data entry. The products are identical to the products we currently have on our active site. For example you can see a product here on the active (old) site: [login to view URL] and the new site here: [login to view URL] In this case there is the 1 configurable product and 106 simple products associated with it. There are 415 configurable products already imported that need to have each of the attributes added to them. Not all products have as many skus, for instance most products have 1 or 2 colors, and do not have a tall/regular option. the information that will need to be added to each simple products is: SKU: follows naming scheme (ex 1450N-4XLT) 1450 - model N- navy colour 4XL - size T-Tall if T otherwise no T. Price: the price per sku needs to be added for each item/sku. there are some pricing schemes that may speed this up or if it is easier they can just be matched to the same sku on the old website. pricing works as follows just in case this may help speed up data entry: 1. every oversize break is 15% more (depending on brand/item there can be more than one break for example model linked above has 3 oversize prices. 2. Tall sizes add 10% to the price. 3. some colours have extra fee as well in the brand "big al" Image: the corresponding image for the products colour must be shown when clicked. This means each simple product will need a product image. I will provide folder with all images named with base sku (ex: 1450N, 1450GR etc.). note: if importing through admin the image field was giving problems and had to be imported a certain way otherwise re-index or saving the simple product after a change the image would disappear. Experience with magento data entry/ product import is what I will be looking for. Please feel free to ask any questions before bidding.