VisibleDreams uses Mahara to support the development and use of portfolios in Higher Education. We believe it is the most robust and flexible system currently available. We hope you will give Mahara a thorough evaluation.
Our Mahara is also fully integrated with our Moodle Mahoodle site http://visibledreams.net/mahoodle/
We do offer consulting services to institutions interested in learning more about installing their own instances. We do not hosting services.