I just installed my lift this weekend. Getting my first alignment and new tires this week. I plan on getting a lifetime alignment since I'm going to keep the Tracker until it won't go anymore, and I'm doing an incremental build so it will definately be going through at least a couple more suspension changes.
Basically for the cost of 3 alignments I will be able to get it done every year, plus when I get new tires, plus whenever I install new coils, or mess with any other part of the suspension.