If you want a straight shot to majors avoid helos. E6s are boring, but predictable. It's hard to get excited to fly 12 hours and land at the same airport. Also, I wouldn't go into it thinking it's some magic family elixir. Lots of divorces amongst JOs when I was there.
OKC is actually a pretty good city, and great for raising a family. Not bad if you're single too. But like Boyd said, the place is run by NFOS and it's a mission that while necessary, isn't fun or challenging and is sort of an afterthought. You're more of a Navy squadron attached to STRATCOM.
Would I do it again? Eh,maybe, but it'd definitely be ahead of Helos.