Turn n Burn,
You have good taste in cars, and kudos on ordering from the factory. I had to do so to get mine with a 6MT last year, as the dealers within about a hundred miles only had CVT models. I got a slightly better price that way, too, which was a nice bonus.
During the warranty period I'd stick with the manual/warranty booklet's terms: 6k mile/6 month OCI, 0w20 with the API SN designation.
FWIW I kept the factory fill (which is a 0w20 with LOTS of moly) in through the first 6k per the published maintenance schedule, and the UOA came back looking good. You can buy Zepro for reasonable prices online, and the 5qt jug is very convenient for a ~4.7 qt sump capacity. For my wife's van, which is out of warranty and has more miles on it(and sees probably 25/75 highway/city, compared to my Crosstrek's 60/40), I put a quart or two of 5w30 synthetic in the 6.x quart sump after the jug of 0w20 goes in.
Incidentally, now is the time to think about getting a Fumoto valve if you want to go that route. We have a top-mounted filter, so you can make oil changes real quick and easy. Under the car there's a plastic pseudo-skidplate with a cutout to access the recessed drain plug, so you have a modicum of protection against the valve getting whacked. Alternatively, you could look into a vacuum oil extractor (Topsider, Mityvac, etc), although I don't know whether the dipstick location on the FB20 allows a full drain that way. Of course, you could always do things the old-fashioned way with a wrench if that suits you best.