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From my recent experience:
-Gigabyte 6800gt (or any other Gigabyte video cards with that cool looking but extremely crap cooling system)
-Albatron motherboards- i have had no end of troubles with them (ive had 2 now), including one that had a fried LAN chip.
That's all for now, i thought it might be a good idea for people to post what components they've had bad experience with, to help people when buying new computer parts.