A few questions before i jailbreak to 2.0.1

[khryptonite]

I currently have a iPhone 3G, fw 2.0.
Because i would like to unlock it in the future, i did not upgrade to 2.0.1 when it became available through itunes.
I am planning to jailbreak it through WinPwn.

1) Does the WinPwn jailbreak to 2.0.1 change the baseband which would make it unlockable as mentioned by devteam?

2) If there is a problem, would i be able to restore to 2.0 instead or 2.0.1 through itunes?

3)Where would i be able to get the original 3g 2.0 ipsw file. iTunes only allows me to download 2.0.1.

4)If i wanted to "format" the jailbroken phone for a clean start, can i follow the steps to jailbreak it again or would i have to restore and then jailbreak?

5) I would like to jailbreak, but more importantly have the option of any future unlock. Is there any reason i should hold off?

Thank you for all your assistance, I am new to the iphone, so please pardon any ignorance in this post.