Magento: Mass-uploading products (with images)

I need help mass-uploading about 1000-1200 products to Magento. My Magento installation has been modified which makes this a little trickier than it normally would. Here's why: 1. An additional field has been added to the product upload form called "artist". The images have to be uploaded with the correct artist selected. 2. Each product has 2 images. 3. There may be other ways the modifications interfere with the upload process that I'm not aware of. I'm looking for someone who has orevious of experience working with Magento and has mass-uploaded products to Magento before. Also, the product images are a bit unsorted right now, so I need you to advice me how to organize them before I send them to you. Thanks. ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Employer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the employer on the site per the worker's Worker Legal Agreement). ## Platform -