Advice on a NAS

[alme55]

I want to get a NAS so i can stream my media to all my devices in my house.  I have an old Hadron air case, 2tb WD Green HD and a 4gb stick of ram in my garage taking up space, what i want to know is should i spend $200 and buy a

processor: Pentium G3258 - http://www.newegg.com/Product/Product.aspx?Item=N82E16819117374 

motherboard: ECS Z87H3-M - http://www.newegg.com/Product/Product.aspx?Item=N82E16813135377 

and a second 2tb hd and use free nas on that build,

or should i just spend $200 and buy something like this Buffalo Linkstation: http://www.amazon.com/gp/product/B00JY4QD4A/ref=s9_simh_gw_p147_d0_i1?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-2&pf_rd_r=1GPAYRN10DSH58G15VEF&pf_rd_t=101&pf_rd_p=1688200382&pf_rd_i=507846

 

Which would give a better experience? and which is worth my $200?

[Compass]

You would get better read write speeds when building your own. UNLESS you spend 500$ on a good off the shelf nas, then the speeds are the same.