Regarding hunter killers:
You can unlock the shark jetbike quite early in the game. That thing has 4k speed. If your craft is faster than the hunter killer, you can still look at it and run away.
Here is a list of the small and very small hunter killers:
Mostly Harmless
Megapol Dropship - small, speed 1000, 280 HP, 39 DPM
Megapol Cruiser - small, speed 1500, 220 HP, 47 DPM
Bandit Wasp - very small, speed 1600, 100 HP, 71 DPM
Megapol Patrol - very small, speed 2000, 100 HP, 39 DPM
Megapol Chaser - very small, speed 3000, 80 HP, 47 DPM
Somewhat dangerous
Raider vessel - small, speed 1800, 200 HP, 85 DPM
Bandit Cobra - small, speed 2400, 240 HP, 78 DPM - high hit bonus
Megapol Interceptor - small, speed 3000, 200 HP, 63 DPM - high hit and avoid bonus
Bandit Mosquito - very small, speed 3000, 100 HP, 83 DPM - high hit and avoid bonus
Quite dangerous
Nazi vessel - small, speed 3000, 400 HP, 81 DPM
Gunboat - small, speed 3000, 550 HP, 111 DPM
Ninja - small, speed 3000, 240 HP, 80 DPM - more dangerous than you think, because of really high hit and avoid bonus
Light Gunboat - small, speed 3300, 420 HP, 77 DPM
Raider Fighter - very small, speed 4000, 300 HP, 94 DPM
Sentry - small, speed 4500, 300 HP, 91 DPM
Really dangerous
Fighter - small, speed 4500, 350 HP, 173 DPM
Viper Fighter - small, speed 5200, 660 HP + shields, 252 DPM
Edit: Now that I look at that list, 3000 speed is the magic number. If your craft is faster than that, you can run away from most dangerous engagements. Too bad the Airspeeder has 3000 speed and thus can't run away. The bounty prize Piranha Airbike has 2750 speed. If that would be buffed to a little over 3000, it would be much more valuable.