I need a unique professional logo

Information on the business: private tuition business
Industry: Education
Type of logo: Word mark, Emblem, Character
Ideas for the visual style: modern, to give the impression that we are a professional organisation, also the concept of being 'clever/intelligent' together with being a tutor or 'academic success'
Where the design will be used: on all marketing materials and website
Extra notes: Business is a private tuition company called Clever Tutors. I want a unique design, i.e. one that does not use existing graphics/images/clip art etc.

Strap line - not got one yet, but your suggestions welcome and whether to embed within the logo or not - yet to be decided.

Ideally, would want several concepts and then revisions.
Final design required in multiple file formats and file sizes (resolutions).