please help

hello you guys i'm a bit lost i don't know what to choose please help me
i have like enough mony to buy only one item what you guys think i should get ?

i need another thing please does any one know how much i will get for SCAR HEAVY if I sell it ?

look :
1st / if u have pistol so u mustn't buy D.E

2nd / if u pro sniper and and u think /it's not good time for buy gun/so buy it AWM

3rd and for gun i like 2 (of "what should i get ?") so i can't tell u what buy dsr1-scarL .
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but sry i can't make 1 of ur guns