I do not know which templates you have seen for ecommerce but my suggestion is that you look at BigCommerce as the platform for the e-commerce site- Why you might ask??
a) Because they have excellent templates and rated #1 company providing easy ecommerce website builders with built in shopping cart feature..
b) Quickly build your ecommerce site and host it with them. It is search engine optimized and
c) Quick integration with Facebook and market your site in Facebook to thousands of users
d) Don't worry on how to ship the product or how to receive payment. Paypal, USPS, UPS integration is inbuilt..
If you buy custom templates, when new technologies come up such as Facebook integration, it is very difficult and costly to upgrade. I know somebody who has a antique store and how much time and money to maintain the site and cannot move in the way the indiustry is moving..
I have done complete reviews for Bigcommerce and other top ecommerce website builder software in the market at:
Also you can read,
Hope this helps and best of luck on your endeavor!!