This hands down... Made 3k off it, and even though everything is tagged as stealing I got no karma hits.
(max stealth) all I did was hide, and steal a plasma rifle... killed the brother, then sister...
All in all 3k caps only cost me 6 stempacks, and two stealthboys.
I would not recommend this in hardcoe... at all. (unless you are an energy build... I am not, and could not hit the broad side of a barn with 'em)