Magento Ready Site edit

I need a developer to customize my Magento "[login to view URL]" website which i m about to launch. - Css menu customization top and vertical - check attachment - At the checkout page "a Vat declaration box" - check attachment - On the product display page, i need ajax price calculator, when customer add a quantity, price should change without page reload. check attachment - And some more small tweak required on the product display page.