I just ordered a diamond axle for my SAS. my reasoning was, theres nothing quite like not having to worry about it. IMHO, if you plan to get more into the offroad scene in the near future, go with the SAS, just think, if you fix up that IFS, would you not worry about it everytime you stray from the pavement? i know i would 
sure it would be cheaper to buy an older truck with an SA, but i feel that the best part about having a built Daily driver is when you see that path off the side of the road and begin to feel adventerous, you can just go for it 
as for lockers, look into swapping in a TRD third for the rear with the electric locker (that is if you can find one from a yard). and for the front i decided to go with arb because when its off, its an open diff no questions asked, and when its on, its locked no questions asked, which just seems to make sense to me for a front axle
You are right crawler I will be worried about taking my truck off road road again with the IFS. Plus having a third vehicle on the insurance is a ridiculous when the vehicle is just going to sit there on the street and wait to be wheeled.
