I will create the new installation of SugarCRM for you.
I will install the teams plugin so that users will only see their own account for you.
The existing install will not upgrade so I will export the data from the old install into a SQL database and into CSV format.
Your part will be to simply import the supplied data including Leads, Contacts, Accounts, and Sugar USERS, teams and roles into the new system.
The old sugar install had custom code to restrict users from seeing others contacts. I am assuming the teams plugin will reproduce this functionality. I will need you to make sure this is the case after you import the data.
BONUS: If you can help me set up a web to lead form for sugar that would be cool.