78C is good, though I prefer 72, 73 or 74 since they are farther from the galley.
16C is problematic, because it is the last row in business and the wall seperating business to economy is very thin. There are usually babies sitted in the first row of economy (row 21, no rows 17 - 20) and that can get nosiy especially on a day flight and in the summer. try to move to row 10 - 12 (small problem with row 12 is proximity to galley).

when are you flying? If its in August, try to book seats on a 772 from EWR that has "772" not "777" listed as aircraft type. You can see in the schedule on the elal website. This is on the new a/c with the lie angled seats.