I just went to my first stampin up party last Thursday, but ended up only ordering some of the patterned paper. I really debated on buying an alphabet set, as my friend hosting the party said she uses those all the time in her scrapbooks in place of stickers. I looked at Hobby Lobby last night - their rubber stamps are 40% off this week, but am still debating. I think I will buy a small set and play around with it.
As to the topic of your scrapbooks lasting, I try to be fairly safe, but don't obsess over whether or not it's going to last forever. I have to ask myself "will my great great grandkids really want to inherit 20 albums from me of everyday stuff-kids playing, at the park, at school, etc. In addition to all my albums (that I hope to get done someday), they may be inheriting another 20 from my kids. Seriously, I think they will, for the most part, end up in the trash someday. I would hope they keep passing down family heritage pictures, but the rest...... JMHO