consolidating services

I'm in the process of establishing an e store in conjunction with useing eBay as a sales avenue.
I have sourced channel advisor and infopia. It seems as if infopia wants a % of each transaction and Channel advisor does not.
I'm looking for a service that provides hosting,customer service ie email so my customers can contact our company,shopping cart and inventory managment and a ecommerce page templet for my non auctions.
I know UPS worldship and Fedex labels can be created out of most providers options.
I guess I'm just looking for a one stop service that provides all. I'm currently sourceing piece meal. Meaning Channel advisor for auction and inventory managment,authorize.net for gateway and such,yahoo for biz email, and seperate accounts for shopping.com,google ad words and bizrate.

Does anyone have a option that would bring these under one roof at a reasonable price.

Thank you in advance