Create an Engineering Services and E-Commerce website

We are a startup engineering design and consulting firm, would like a simple website that describes our company and lists 3 hardware products that we have, and allows e-commerce setup where people can pre-order our system(s). It would be nice if it automatically processed the orders and sent receipts, allowed us to view administrative screens such as orders, process refunds, possibly tax implications, etc.

*special requirement, I would like to use the Bitpay API to accept Bitcoin. Info at www.bitpay.com. They have shopping cart, billing, and payment gateway APIs and plug ins that are compatible with wordpress, open cart, Zen cart, etc.