Also, you want lots of X Weapon Officer (either is fine) and Transporter Officer doffs for the marauding missions. Having Assault Squad Officers is good too, since some of them take those as well. But definitely Transporter guys with the good traits (I believe Unscrupulous is one of them).
Make sure you don't have a hold full of prisoners. It's really annoying when you fill up and then can't complete other missions: the Ferengi freighter/trading post ones tend to give both lots of contraband and prisoners, and if you can't get at your contraband, that sucks.