This is one of the reasons I'm thinking about getting out of the Hobby....Even the regular base sets from Topps are becomng a pain in the butt to complete, not to mention the pain in my wallet....Why can't they just make a set witout these SPs and so-called errors....I have not been able to put a full set together since 2005.
2006 has the 4 variations of Alex Gordon, plus a couple of others
2007 has some NO SIG cards (not so tough to get), but in the Update set you have the Squirrel card and the Joba Chamberlain variations
2008 you have the Johan Santana #661, Red Border Gulianni card, and the upside down cards in the update set (Bruan, Bruce, Fukodome)
2009-- all of those SP cards of the old time players
2010-- Abe Lincoln on the wall?
Its more of a scavenger hunt now....It is taking the fun out of set building for me personally, partly my fault though because in my mind the set is not complete unless I have those "other" cards