I used nylon faced 15 amp receptacles for my house. I seem to recall that they were a couple of dollars cheaper than the 20 amp ones, and if you look close, the 15 amp has the innards of a 20 amp installed in it, just the different face plate on the front. Nylon Levitons have a flat face with no indentation around the slots. In the shop I used the exact same receptacle, sans the nylon face, on one side of the shop, the other side, I used a very similar quality Cooper (Eagle) brand receptacles.
Installing receptacles ground pin up, or ground pin down, is largely personal preference and if you have receptacles to be used for fridges with the 90 degree plug, or computer cables or power supply cables that not only lay flat to the wall, but exit the receptacle at a 45 degree angle from vertical, you might want to install them so your cords lay or hang properly.
NEC DOES NOT address the up or down installation of receptacles. In my log house, mine are mounted sideways. Previous owners had installed them willy nilly, whichever way the wind was blowing that day (owner constructed house, whole 'nuther story) so I replaced the cheap 49 cent receptacles that the lamp plugs kept falling out of, with the Leviton Nylon faced, back wired receptacles, and put them all with the ground pin on the left, which just happened to put the neutral on top, but that doesn't really matter, they are all the same now, so I know which way to hold the two prong "polarized" plugs when I plug them in.
Charles