20 amp circuit and GFCI outlets everywhere
It's wasteful. 

I realize that most folks think with their wallets and not much further, but #12 wire contains 59% more copper than #14 (source). That's (nominally) 59% more energy wasted and pollution created in mining, 59% more chemical pollution from refinement, and 59% more weight to lug around as you work. 

It's also much less pleasant to work with in a box, and fills boxes and nuts much quicker in terms of legal capacities.