well MacRumors doesn't advocate torrenting so none of us can give you a "yes" opinion technically, but MR aside, don't go torrents. Sure it's free, but it is illegal and you don't get the proper updates Microsoft releases [AFAIK], and with Office barely supporting OS X Lion [office definitely works, but it hasn't supported all the lion features yet [full screen, etc]
Now since you use only Word and Excel, [on your PC] I figure that Office 2011 will be the User Friendly one for you since you know what Office feels like, but YMMV
what i suggest is you download trials of both of them [un-installations are extremely simple on macs

] and try them for yourselves.
My vote goes out to Office, but Pages and Numbers aren't bad [though they aren't as feature packed as excel]
TRIAL LINKS:
iWork
Office 2011
they are both 30-day trails so you can download them at the same time, and then purchase either one and uninstall the other, or whatever...