Business B2B / B2C Website PLUS CMS & Ecommerce

Hi I am looking to replace all my existing websites (3) and roll them all into one incorporating a full feature ecommerce and cms package to the front end and then integrating my Sage Accounting package using Sage Connect ([login to view URL]) . I have written just about everything i can think of - the platform(s) - that said, technology moves on and i am open to suggestions. This must be viewed as an ongoing long term project - i am after someone that can do work for me to further enhance/ develop the site. Social networking is very important and must be seen as part of this project. As stated whatever cms / ecommerce platform used HAS TO BE compatible with Sage Connect (view [login to view URL]) which will integrate to our Sage Accounts package. Please read my requirements carefully and advise