It's the perfect future Y Combinator startup. The business model is exactly the same as Yahoo Stores, so it's well proven to the YC partners.<p>It is a somewhat hard problem, so you'll need a team with great hackers and almost definitely a designer.<p>While Shopify has built a best in breed product, it certainly hasn't dominated the marketplace. E-commerce is a slow moving marketplace, you'll have plenty of time to outsell Shopify. You could even undercut them on price for a while.<p>Shopify only just raised their Series A round so you aren't even that far behind. http://www.shopify.com/press/articles/7-million-series-a-funding/