not much point in painting with actives, since the you can't shoot anything thats incoming. The way i use stealth ships is to sneak into a system, cut to zero thrust and wait a bit, if i don't see anythign I pick up speed and move slowly to the core to keep the thermal sig down. Then I park at a nice unoccupied planet or moon and just track the activity.
Based on that principle, no actives, but you'd want a longer Est Time for overhauls-- 3 years or so. I spend most of my time parked, so I don't need much fuel, but parked still runs the overhaul clock.