What should I read first?

I just bought "The Theory of Poker" and "Tournament Poker for Advanced Players" by David Sklansky and was wondering which one I should read first or if it even matters. The only other two poker books I've read so far are "Harrington on Hold 'em" volumes 1 & 2, and have just started to apply the concepts I learned with moderate success (need to work on my endgame). I rarely play cash games, basically 50% SnG and 50% MTT but I want to focus on MTTs more. Are there any other good books I should be reading?