Pay for Usenet, or buy hardware for Torrents

I wanna be able to download tons of stuff more, so I need new hard drives. They could be an array on my current gaming desktop or they could be put in my old one, which is currently collecting dust, along with new quiet fans and underclock for less power for 24/7 use. Should I pay for Usenet or host and store torrents from another machine for no subscription but with a larger initial investment?

What have you done with your old machines?

$15/mo unlimited Usenet + cheap money for nzb subscription - wouldn't that be a LOT less money than colo'ing a box from both initial investment and monthly service charges?