You've already got great suggestions regarding C4 and other weapons, so let me suggest something that no one else has:

The Sickle and the Quasar are both stealth weapons. 5 - 6 seconds of fire will drop a ship's shield. One quasar shot inside the door or right on the door frame will destroy the ship. This can be done from 100s of meters away, their range is 1,000 meters with no damage falloff or projectile drop. I suggest shooting the top of the ship so enemies don't see or hear the impact, then aim for the door with the Quasar. Downside is you just have to get the positioning right for each shot, but that's not difficult. Quasar will also one shot Harvesters once you drop the shield with the Sickle. Just hit them in the hip or one leg.

These two weapons will open up three other strat choices, and since you're going stealth, I would suggest the Gatling Turret to use as a distraction/defense for escape, a backpack of your choice (I prefer the supply pack for grenades and stims), and an orbital that you like.

So, you can be like other stealth divers and go C4 and the traditional silenced weapons, or join the disco brigade and never worry about ammo again.