Which option to choose?

So I'm gonna buy an ultimate game card sometime soon, and get like 20k ZP. So out of these 4 options, what should I do? I don't get ZP very often/easily (surveys don't work much for me) and I want to use it all smartly. I already have 2k.

1. Spend it all on M4 Custom crates.
2. Get GP and spend it all on XM8 Adv crates.
3. Get GP, buy XM8 and spend the rest on XM8 Adv Crates.
4. Get a little GP, buy XM8, spend the rest of the ZP on M4 Custom crates.

I really want both crate guns, but I want the M4 Custom more, but Ill probably have a better chance with the XM8 Adv.

Option 3 is only there because I want the XM8, but want the Adv version too, but I want to at least get one permanent gun from the ZP.

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