In a keeper league where 80 of the top 100 players are already kept....I see little difference in draft position for a snake draft. If you let me pick my draft spot, I'd either take the #1, or #2 (for the best available player on the board) or the #14, 15, or 16 (to maximize the value of your first 2 picks). I believe a snake draft in that format is useless. In my two keeper leagues (same format, 16 teams with 5 keepers per team) we do a straight draft in reverse final standings order from the previous year. It works out very well (the theory being that the bottom teams have below average keepers and the top teams have the best keepers...the straight draft helping minimize this starting advantage, but not eliminating it). The advantage of teams with high draft position in a straight draft in a keeper league is very small.
2011 World Champion St. Louis Cardinals