have 60 coupons: what gun should i aim for?

coupon guns i have:
M4A1 Custom
DE-camo
Ak47-knife

guns i dont have:
Ak camo (dont need)
Aug camo
Psg RD
Awm camo
DE gold
M4a1 crystal (i heard its not worth it )
m4a1 gold
ak gold

comments: im not sure if i should save up for the gold guns or not. i already have an m4a1 custom and m4a1 silver as well as a m4a1 adv for about 2 weeks. i also have an ak knife and an ak silver so i don't know if i should get the ak gold too. i have a DE camo and an anaconda adv so i also dont know if i should get a DE gold. i own a MSG 90, awm, and DSR so i don't know if i should get one of the snipers.

guns i might want more than anything:
AUG camo (i have regular aug and i really like it)
DE gold (i recently got 4 bags so i might need another good pistol)

Please tell me what u think i should exchange for