pro theme

I would like to upgrade my theme to something more professional(like a paid theme) but Im worried about buying one and not being able to configure it like I would like. I need the help of someone more experienced to help me upgrade and created the site I want but who wont charge me a lot of money. Just basically help me pick a low cost template(or tweek my twenty eleven theme) and help me configure it to serve my purpose. CAN ANYONE OUT THERE HELP?