I know yootheme/rockettheme is good. But their new template/design is like a simple. I'm looking to best and easy to modify the template/framework. thank you.
It's rather simple yet powerful joomla framework with free themes http://www.shape5.com/joomla/framework/vertex_framework.html
It is difficult to answer which one is the best. Most companies develop templates based on framework Gantry, T3, etc... Gantry is probably the easiest to manage, but the heaviest. Though frameworks offer some major benefits, there are drawbacks related to caching, as practically everything is getting cached 2-3 times by Joomla core, sometimes component and the template.
You can hire professionals from DP and many php coders will be able to perform the tasks for the requirements.
It's so difficult to say who is the best Joomla provider because there are so many. We also provide so many templates for Joomla, there are so many free for you & we're going to released WordPress. You can access our site to consider. We also suggest some for you like joomlashine or gavick..
I've done dozens of sites for many different clients. Without a doubt my favorite are Gantry framework templates like those from RocketTheme. If you want ease of use go for Gantry. YooTheme is also quite good but not as easy to configure in my opinion. My least favorite would be Jooml-Art. My personal feeling is that their control panel is incredibly confusing and does not provide the template controls that I often need easy access to. Gavick is okay (love their news modules) but sometimes their template stuff doesn't play well with other modules or components without having to putz around with the CSS.
You can just browse on google like 'Best Joomla Templates', 'Premium Joomla Templates' to get good, beautiful, best and high quality template provides list.