As you may have already realised there are differences in the way that Apple describes networking issues such as encryption. If you are using Windows Vista, the descriptions there are more in line with Apple's approach -- but most network manufacturers stick with terminology that would be more familiar to Windows XP users.

If you can swallow the price difference, the Airport may be a good choice to keep things simple.

Belkin does not have the best reputation for its routers, though check reviews as that may no longer be justified -- personally I'd also look at brands like Netgear, Linksys, Dlink.