Looking for a CRM system

We are a software company selling software products on our website. And we want to have a CRM system to maintenance all information about the customers(such as the name, address, phone, email address) and their orders(such as order ID, tracking ID, purchase method, etc.). The detailed requirements are:

1. Has a web-based interface for the administrator, the staff members and the customers.

2. Has a background database, such as MySQL database, contains all the information about the customers and their orders. And we can add additional fields according to different requirements.

3. The administrator can login via the web interface and perform all the administration tasks, including add/update/remove/search customer records, add/remove staff members and set their privileges which define the operations they can do on the CRM system.

4. The staff members can login via the web interface and perform the tasks according to their privileges set by the administrator.

5. The customer can login via the web interface, which is called "Customer Area" or "Member Area", where he can review or update his profile(personal information, such as name, address, phone, email, etc.), review his order information, re-download the software product he has purchased in the past, access the customer-only technical support service, renew his subscription to technical support service, and purchase an upgrade of the software product if he want.

6. Can add customer data to the background database automatically via a form or GET/POST methods.

7. Support to import customer data in XML format.

Does anyone know a CRM system support all these features? Thanks.
Alan Chen