Having done a significant amount of custom LMS development and worked in information security, sharonkay11's concerns were the first things I thought about when reading John's invitation for advice. If your school or district provides a tool, try to use it first. If it's just plain bad, as many of them are, work from…

I'm an instructional designer, and I've worked with almost all of the options you're considering. Since you're new to the blended environment, my best advice is to use whatever solution the school provides. There are good reasons for this: