CS-cart modifications

Hi There, I'm looking for a PHP-expert, who is extra familiar with CS-cart shopping cart software. I would like to get him to make some PHP modification in that software. The CS-cart support could do these modifications, but I would like to find a more flexible, faster and cheaper expert. These modifications will be: #1: Global option settings - The product cost will be calculated consistently by the positions of the current product options. And the product cost will be calculated not from the initial price of the product, but from the previous price (considering the previous option). #2: Sections of profile fields - The task is only delete the "Shipping address the same as billing" checkbox. And all other fields will not be modified. #3: Subtotal option in reports - You should add "Subtotal" values to the bottom of the sections. #4: New ingredients module with Ingredient's inventory history. #5: View orders with more option - You should add more profile fields to the search section on the "Orders" page. I have detailed descirptions for these modifications. The most important modification is the #4. Thank you, I am awaiting for your answer.