491442 Website / Cart / Paypal

I need a site with the same functionality as this website (just the part where you order custom cd's) [login to view URL] PMB me for more specifics - but here is the general idea of what I need. You will take a spreadsheet containing 4 pieces of data Song #, Artist, Song Title, Song Length and create a database. The customer has UP TO (but doesn't have to max out) 70 minutes of music they can add to the CD. The site will keep track of their selections, calculate the ongoing cost (as they add songs) and also keep track of how many minutes the songs total (so that the customer does not go over 70 minutes). Once a customer picks their songs, they will proceed to a paypal checkout and the songs and sales receipt will be emailed to the vendor. This functionality will be incorporated into an existing website (I have the PSD's for the site)