I'd say a Swarm/Muscle hybrid. Not exactly small ships (BBs, 800kT), but they do better hunting in packs. Using plain old vanilla tech, I max out engines, put on one, *maybe* two shields, Stealth/Scattering, and 3 Organic or Crystalline (depends which one I have
. Weapons are 3xH-EAGs (w/ Organic) or ShieldOnly/ArmorSkip combos (w/ Crystalline), 1xH-EngineKiller, 1xH-WeaponKiller, 1xPDC. A seperate design is devoted completely to PDC, usually retrofitted to the main attack design after attaining substantial experience.
With quasi-Newtonian movement, I would probably sacrifice a small amount of firepower for increased speed. Probably have three designs, one ditching a EAG, one ditching the EngineKiller, one ditching the WeaponKiller. With P&N2, I would probably also get a few fortresses that sit on warps and act as staging points for the the pack fleets, or as flagships for multiple packs invading.