[I Only Smoke 4 the Cards]

I am at a similar crossroads and looking for some guidance. I am working on a low grade set and getting a little burned out. The set is so large that it seems as though I may never get there. I figure that breaking the monster into chunks is probably the best way to deal with it. You know the saying: "you eat an elephant one bite at a time."

Any advice on which team sets are the cheapest to build?