Which cross class abilities should i get for Machinist?

[Bigcat9715]

You know, I totally forgot this was a cross class since the only jobs that can cross class arc are smn and blm, and they don't get access to physical weapon skills, but has everyone else also forgotten that Straight Shot is cross classable? I am now very much looking at b4b, invig, RS, HE and SS.

SS is only for GLA/ PGL/ MRD/ LNC/ ARC/ ROG/ BRD