PHP Framework suggestion

Hello! I am a freelancer and I was given the task to create a car park / junkyard site. However, I dont really know what to use. I thought of using a CMS but I will have to modify quite some stuff to fit my needs and I'm affraid I will bump into the CMS' API and that will set me back alot. What do you recommend? Keep using a CMS (and if so, which one?) or go for a framework? I think it's better to use a framework so that everything will link together nicely. However, I have little experience with frameworks but I'm not affraid. Do you have a suggestion for a PHP begginer (sort of). I tried CI and Smarty but I don't really feel at home with them.

Thanks!