I recommend that you consider using a hosted Moodle solution. I just googled "Hosted Moodle" and found Key To School Moodle Hosting company. Their prices start $50 per year for 100 Moodle users. Also, the following recent presentation on LMS might help you decide which LMS to choose:
DEMYSTIFYING THE OPEN-SOURCE LMS
Thursday, June 27, 2013 2:00pm - 3:00pm EDT
By: Katherine Robeson and Jim Yupangco
Considering an open-source learning management system? Will an open-source solution give your organization the reliability, robustness, ROI, and flexibility that it really needs in a learning management system (LMS)? Join us as Lambda Solutions and Elearning Experts, two organizations with decades of experience using and supporting open-source initiatives, explore the truths and myths surrounding open-source LMSs.
Explore key considerations in selecting and implementing an open-source LMS solution.
Discover how open-source LMSs are an attractive alternative to proprietary LMS solutions.
Learn how open source can save you time and money on implementation.
Explore how open source unlocks new possibilities for customizations and integrations.
Understand how open-source functionality compares with that of proprietary solutions.
Discover how your organization can benefit from hosted and supported LMS systems.
This webcast will answer all your questions about open-source LMSs, leaving you well-prepared to discuss the many benefits that open-source solutions can deliver to your organization.