Developing a website from the ground up

I am in the process of redesigning a small store website. The current version of the site offers users the ability to see a weekly flyer and read some details pertaining events at the store. As part of the redesign I would like to move away from the current cms (Joomla) and rebuild the entire site using a different infrastructure. I am proficient in Java and hence have been looking at GWT as the primary choice in creating a dynamic site. Do you have any other suggestions regarding frameworks and/or CMS systems?