Buy necron or buy upgraded necron?

[FrostyV222]

I'm Cata 22 rn, but I'll go for Cata 24 and get F7 comp today, so I was just wondering if I should go buy a recomb, 5-star, potato book, ancient necron armor, or should I buy a base set and upgrade it myself, which MIGHT be cheaper. Also, I don't have 100 sadan killed, so should I just go for the necron helmet too? or 3/4 with another helmet?

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