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the PSU position of KT series really suck. we can't use the psu swithout mod
i think you just need to add a 120mm low speed fan that's good enough because the vents are everywhere.
htpc you don't need a monster system. a c2d cpu is more than enough. gtx260 generates too much heat
don't forget...
why don't you go with kt600 looks nicer and about the same the price? mMEDIAPC 6000B is nice and roomy but the front panel sucks. the HDD lead is so dim
if your TV has DVI port go with gtx260, if it doesn't have DVI get the card with HDMI port to play 1080p movies
i was looking for an htpc case too. i saw KT600 on ebay and i love it but one thing i don't like is the PSU spot. why they design the PSU in front? I ended up with mMEDIAPC HTPC 6000B.
the KT400 i think should be find with the air flow because a lot of vents