Iselin section of Woodbridge township borders north Edison (“best” are of Edison) and has what you need except it’s congested.

It will be congested everywhere until you go down to West Windsor (Mercer I know)/plainsboro. Once you get down that way it opens up a little bit. Brutal commute to Newark though.

South Edison - 08817 is more affordable than north Edison - 08820. Not as nice (smaller lots, “worse” schools but that’s not a concern for you)

I love metuchen - nice downtown and great commute to city and Newark with the train right there. Not sure if you could find a move-in ready SFH for $600k but if you can, that’d be my choice.