If you had the choice of becoming a Spartan from the [u]Halo[/u] series, would you? I would. You can also choose any set of armor.
Edit: Here are some things.
1. You won't be a virgin like Chief.
2. You can choose any type of spartan. Spartna IIs, Spartan IVs I don't care.
3. You HAVE to fight the Covenant. But you can go back home whenever.
4. You get the weapon of your choice from any Halo.
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I'd go for spartan 4 since the augmentation process doesn't seem to be that dangerous