Preparing to wire my new home and have bought 12-2 wire and 20A breakers for all baths, my basement workshop, garage, and the kitchen/dining area. Purchased 14-2 wire and 15A breakers for all other outlet circuits and lighting circuits such as living room, hallways, and bedrooms. Now I've been told by a couple of other people that they would run 12-2 with 20A instead of the 14-2 with 15A breakers everywhere. I'm considering exchanging all of my 14-2 and 15A's (about 2000' worth) for 12-2 and 20's. Should I go with 12-2 and 20A's in the bedrooms as well since they require arcfault breakers? Should I go with the 12-2 just to "overwire" a bit in the bedrooms for potential future loads such as computers (is 14-2 sufficient or 12-2 necessary for computers)? Would I be wasting money and some time since 14-2 is cheaper and easier to work with? Any thoughts/suggestions?