Last thread help with this build

Zidane10

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Mar 3, 2015
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I have 2 gtx 980s gigabyte ge force g1

An i5 4690k

16gb of ram
And not sure if i should get 850 or 700 psu

And for the motherboard i might just get any decent mother board thats a z97 and runs sli, correct me if im wrong.
And still not sure which case if i need a mid or a full tower

And my main question is would i need to change the stock fans of the processor or the case?