Sussex Cty is a fairly large place, Sparta is nice, expensvie and fair for commuting, Vernon is a nice little town (64 sq.miles) with $$$ housing.
Good schools, hmmm Vernon HS has its own problems, taxes are high.
Pompton Plains/Pompton Lakes not bad.......Butler expensive. The commute into NYC can be a hard one especially in the winter, my daughter travels from Vernon to Livingston via 287 and it takes her nearly 2 hrs one way so nights especially if theres a accident. Friday nites on Rt 23 is a horror, backups all through the S turns.
Do your homework or take a drive out to Sussex Cty and look around and see how long the commute would be and remember the winters its no fun.
I traveled from Vernon to Tarrytown, NY everyday and it took me 1 1/2 hrs each way and I took back roads from Warwick, NY at 4:30AM with no one on the road.
Good luck on your search