Book publisher's website/catalog/store in Wordpresss

I'm setting up a small book publishing company. I'd like an existing Wordpress site template to be customized to add a catalog/store, with shopping cart functionality. I don't mind what plug-ins are used, what's important is that the CSS matches the existing site template, so everything looks the same. My site is at [login to view URL] (ignore current content, it's just dummy content). The site template is 'Milan' by siiimple.com. What I'm after, in terms of site map, is something similar to [login to view URL] or [login to view URL] or [login to view URL] in that customers must be able to see some nice multiple images of the finished books, and be able to add them to a cart and then pay through PayPal. No Flash. Any questions, or further details, just ask.