Custom Onepage Magento CheckOut

What I need: A custom checkout for magento on the /checkout/cart/ page below items in cart. CHECK THE ATTACTED IMAGE I know of 2 webpages that have exactly what im looking for and i will provide links to those under way. What I already have versus what the provider will build: For now im using the basic magento checkout Other context/requirements that providers will need to know: - I dont want it to modifiy core. - i want it to be easy to redesign / reprogram Specific expertise that I am seeking: Someone that really knows magento Timeframe for delivery: As soon as possible Testing: i will test and guide all the way. we can communicate on skype, msn, email its up to you