I have been developing Joomla websites since 2008. I have performed numerous upgrades some of them via freelancer.com. I suggest you check my reviews. I will migrate your site but also clean it up.
Relevant Skills and Experience
joomla, css, mysql, html, php, software development life cycle, english, US business
Proposed Milestones
$1250 USD - Deliver the migrated site for tests by client
$1250 USD - After acceptance by client
Additional Services Offered
$90 USD - Hourly additional work for future maintenance. I can also offer monthly package to administer site
It would be helpful if you could share the url of the site and give me an idea of the volume