I would suggest some security screws and T-nuts. I dont know if anybody has heard of the company "Fastenal", but I work there in Nashville, TN. There is stores all over the country though. We sell all kinds of bolts, screws, nuts, ladders, wire terminals, basically anything you would need on the construction site. (
http://www.fastenal.com )
I have a few hotels that have bought those security screws for their tv's and whatnot. They come with a bit for them too. They love them and thats exactly what im doing in my next install. Honestly, Fastenal is expensive and im cheap so i dont know about shopping there other than my kickass customer service, but im sure you could find them somewhere.
Anyway, thats my 2 cents.