Help!!

Im about to get 100k zp i cant decide what to get because i have 40 coupons a part of me says get the m4 silver and if i do what am i going to do with the 40 coupons get the custom? but thats pointless since im getting the silver and what crate should i go for? or should i just wait for halloween patch. and i dont know when that will take place. its all so confusing lol i need some help!