Looking back on my career, Helos cost me 5 years seniority at my Legacy airline job. That HURT.

No question:

P-8s if you want to deploy.
E-6s if you don't.

If I had your choices and my ultimate goal was the airlines there's NO question:

E-6s
P-8s
TacAir
E-2/C-2
Avoid helos like the plague.

Consider what a loss of 5 years seniority in a 25-30 year airline career will cost you in terms of:

Capt. Upgrade
Widebody flying
Bidding
Pay
Quality of Life
401k contributions.

Once again...AVOID HELOS LIKE THE PLAGUE.