I'd try to get in touch with a local IT VAR, someone with experience with this stuff. Get them onsite, tell them what you have to work with and they should be able to pitch 2 or 3 ideas, go over the pros and cons of each and answer questions. It's a pre-sales pitch, shouldn't cost any money.
If you were in my neck of the woods I'd be bugging you to get my company onsite
.