Amazon - Recommend a store-type theme?

Been looking around at WP themes aimed primarily at Amazon affiliates. I've downloaded some and was pretty dissapointed at the lack of functionality, and were generally crap for SEO.

A theme that I'm looking for needs to:

• look like an e-commerce website;
• decent for SEO;
• easy to customise;
• have product categories (grid) on the home page

Can anyone recommend one based on personal experience (or even heard of decent ones)?