Personally on a civic the ideal fitment IMO is 16x7 +42, on a Glanza im using 15x6.5 and have had my arches rolled and used spacers to get the tyre flush with the arch for the perfect stance
He mentioned civics in the states running 8/9J, i tried 8J myself and its ridiculous on the civic and a complete pain, in the states they are mad for it but would have had a lot of arch work done
Im running 15" TE37's with 286 KSports and had to run 20mm spacers and i can barely fit a peice of paper in the gap! If i was you id try them on first before splashing your cash
If i want something il save for it, im into cars way too much though... Spend 100% of my wages every month on them :/ time to put an end to that though and save for a house before prices go back up and im left with nothing but 2 nice cars and a load of parts!