A Few Questions about Jailbreaking

[DBZHeroes777]

Hi there,
I just wanted to ask a few questions about jailbreaking. I'm already jailbroken on Spirit with an iPod Touch 2nd Gen 3.1.3.
My questions are:
1. My iPod is freezing up on me, I want to restore it but if I restore it, can I jailbreak it again? And if so will I have to use Spirit?
2. I want to get iOS4 jailbroken so can I downgrade from 3.1.3 back to 3.1.2 and then jailbreak to iOS4?
3. If I can downgrade then jailbreak iOS4, will I be able to change my jailbreak once the planetbeing/musclenerd jailbreak comes out?
Please try answer any of these
Thanks a lot

[ebildude123]

Yes but don't have to be spirit.