CX or KA... long term career
Long term career is spot on, 15+ years to command in CX and somewhere between 7-20 for KA
You would however earn considerably more as a CX/KA F/O than a AHK skipper, mind you it's academic as CX/KA not hiring F/Os at the moment to my knowledge.
ATPL, AHK not a bad outfit and for the days off you get, the money is not bad, some good people there too. Just get used to being the poorest cousin of CX ( KA being top poor cousin ) and don't worry too much about your rich relatives COS's, and you'll be fine.