I would keep:

1. Ninja and Shougn Zords, because they have massive firepower and fighting abilities in my opinion.
2. Zeo Zords, just because of their awesomeness.
3. Astro Megaship, because I wouldn't need to build a house for my own family when I get a job and meet the right girl.
4. All of the Lightspeed Rescue Zords, because of their mega massive firepower.
5. Q-Rex... I always wanted a giant dino in my room!
6. Minizord, because he could make a heck of a Megazord.
7. Drago Stegazord. He kicked some Ranger *** in DinoThunder.
8. Delta Command Megazord, because it's massive.
9. Omega Ranger's Megazord, because it's from Sam's time.
10. Manticore Megazord, because I just love it.
11. Catastros, because I never got to ride a restless horse in my life.
12. Brightstar, because he was just freaking awesome!
13. BattleFleet Megazord. Why? Read no. #12 again.