Torrents don't need much processing power, but if your main rig is stuffed with fans you gonna have problems with noise at night.
Putting together dedicated fileserver is quite easy - any case with 120mm fans cooling drive cage, 350W PSU (FSP is a good brand), mobo with integrated video, 512 megs of RAM, low-end Intel Core CPU, hardware RAID card and as much HDDs as you can afford in RAID5. You can also buy a NAS or router with bittorent client if you need a silent and compact system, check smallnetbuilder.com
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