I think only a security chipset installed doesn't mean you can run away from hackers
Tablet is new and quite expensive to me.
Tom, if your purpose of buying a notebook is nothing except what you said in your post, I think Apple is good enough, it is much cheaper than IBM's. You can choose a 12" with option to increase your ram to 512, bluetooth module so to only pay around $1250. Nothing differing that much between 12" and 14", 17". I advise students to buy 12".
I don't know how people will think about Toshiba, but I advise not to pick it, as well as FMV, Melbius, dynabook, hp, dell. These are not really very good although they are cheaper...