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Well upgrade to 4.2.1 if you want.
If not, that jailbreak vid will still work for 4.0. Just download the 4.0 firmware from the link he gives.
You might as well be on 4.2.1 though.
It doesn't matter which device you have. Update to 4.2.1, then run the jailbreak and carrier unlock.
The 3G won't be tethered either, which is a bonus. A4 chip devices need an additional jailbreak to remove the tethering.