So I'm thinking of making a non force detective/ private eye, but not sure what careers and specs work well. Thoughts?

For a non-Force version, you're probably on the wrong forum. Try the Edge forum.

I suggest waiting for "Endless Vigil," where such a Career is rumored to be part of the Sentinel source book. It's due in quarter three this year.

EDIT: Missed the NON-Force using prerequisite. I second the advice for shifting this topic to non-Force using character forums, like AoR or EotE.

Yes, I'm very excited for endless vigil. Sentry and investigator and maybe wardern = force batman.

Perception, Vigilance, Streetwise and Knowledge Underworld are the core things that make up an Investigator, so long as you hit those points the rest is just flavour on how you actually get the job done.

In the Far Horizons splatbook there's the Marshall spec that works well for a cop; they also suggest mixing it with Thief to make a Private Investigator, or Scout for a Sector Ranger. For a force related spec, wait and check out the Investigator in the Endless Vigil career book, as others have suggested.

Endless Vigil isnt rumoured to have an investigator spec. It does have ir was announced in one of their previews.

Perception, Vigilance, Streetwise and Knowledge Underworld are the core things that make up an Investigator, so long as you hit those points the rest is just flavour on how you actually get the job done.

I would also suggest the My Basket is Full talent.