[quote=@DoctorGenesis]
Custom built is better than giving Bill Gates money, no seriously I got all my parts from thrift-stores/landfills/friends/family and my PC has 1 Terrabyte harddrive over 60 gigs of ram (or something I can't remember from when I built it.) A newer graphics card, flatscreen and Ubuntu as the OS. IT'S DAMN FAST BABY.
[/quote]

If you just want a regular old computer there's not much difference between the cost of buying versus building. But if you want a higher end machine for gaming or video editing it's cheaper to build than buy and it's easier to customize.