Magento CE Site Upgrade from 1.4 to 1.7

We are looking for an individual or company that is an expert in the upgrade process of Magento CE. We require our current site to be upgraded from 1.4.0.1 to 1.7.0.0. Here is a rough outline of what the project entitles. 1. Upgrade Magento CE 1.4.0.1 to 1.7.0.0 - Create copy of working live website - Upgrade current site on staging server - Remove all current extensions and install and debug new set of extensions (5 - 6 extension install) - Address any and all php errors - Fix theme display issues 2. Upgrade/Update Current Theme (not looking for a redesign) - Re-implement current design insuring the following - W3C Compliant - Cross Browser Compatible - Standard Magento Theme Design - Meets all of our design requirements - Test and debug any and all issues 3. Transfer to Live Site - Backup entire live site, directories and database - Install new Magento site with minimal downtown ( Give us a estimated down time) - Test and debug any and all issues that may occur - Re-install old site if to many issues arise Here are some details about our site. - Approx. 1800 products - Database Size Approx. 3GB - Total Site Size Approx. 2GB - 3 Magento Stores - 6300 Customers - 11000 Orders Here is a little more of who we are looking for to take on this project - Prior experience with upgrading Magento required (Please be ready to supply some examples and references that we may contact upon request) - Comfortable with PHP and Zend Frameworks - Experience with Magento theme design, including CSS, Javascript and best practice standards - Has extensive experience debugging Magento extensions and template issues In your responses please give us details including estimated time frame for completion and price for each section of the project SEPARATELY as follows: 1) Magento Upgrade from 1.4 to 1.7 (including transfer to live site) 2) Installation and testing of extensions/add-ons 3) Website theme/CSS update Please state any requirements you may have or concerns. If you have any questions please feel free to send us a message.