My daughter has just put on her Christmas list that she wants an Encyclopedia set. So I'm looking and holy moly!! 2008 publication year is crazy expensive!! Do you guys have any suggestions as to what would be the best kind of Encyclopedia set to get--there are so many and also, how important is the publication date...really? I imagine she will have these for a long time and she's in 6th grade now...I bet she'll have these even through high school...they'll be outdated by then. Any suggestions??