vBulletin Overkill?

[cacak lacka]

My student engineering group has asked me to start a forum in order to make it more convenient to create/discuss new ideas for competition. I immediately thought of Vbulletin since it seems to be the most popular forum in use. However, after looking into the cost, I believe it may be a bit overkill for our application. Here is some info regarding our proposed forum:

-Max accounts ~200
-Max users online ~10
-Needs to be very secure (we don't want other competing schools gaining access).
-A built in file hosting system would be very nice (small files e.g. docs, jpegs, autocads, etc.)
-My web programming skills are limited

So do you think vBulletin is appropriate for our needs? Or is there something else out there that would better satisfy our needs? We basically just want this forum so we can communicate easier and allow everyone to get some input in the decision/design process.

Thanks!